2009 flu pandemic
Pandemic H1N1/09 Influenza
Classification and external resources

Electron microscope image of the reassorted H1N1 influenza virus. The viruses are ~100 nanometres in diameter.[1]
MedlinePlus 007421
eMedicine article/1673658
MeSH D053118

The 2009 flu pandemic was an influenza pandemic, and the second of the two pandemics involving H1N1 influenza virus (the first of them was the 1918 flu pandemic), albeit in a new version. First described in April 2009, the virus appeared to be a new strain of H1N1 which resulted when a previous triple reassortment of bird, swine and human flu viruses further combined with a Eurasian pig flu virus,[2] leading to the term "swine flu" to be used for this pandemic.[3] Unlike most strains of influenza, H1N1 does not disproportionately infect adults older than 60 years; this was an unusual and characteristic feature of the H1N1 pandemic.[4] Even in the case of previously very healthy persons, a small percentage will develop pneumonia or acute respiratory distress syndrome. This manifests itself as increased breathing difficulty and typically occurs 3–6 days after initial onset of flu symptoms.[5][6] The pneumonia caused by flu can be either direct viral pneumonia or a secondary bacterial pneumonia. In fact, a November 2009 New England Journal of Medicine article recommends that flu patients whose chest X-ray indicates pneumonia receive both antivirals and antibiotics.[7] In particular, it is a warning sign if a child (and presumably an adult) seems to be getting better and then relapses with high fever, as this relapse may be bacterial pneumonia.[8]

Initially coined an "outbreak", the stint began in the state of Veracruz, Mexico, with evidence that there had been an ongoing epidemic for months before it was officially recognized as such.[9] The Mexican government closed most of Mexico City's public and private facilities in an attempt to contain the spread of the virus; however, it continued to spread globally, and clinics in some areas were overwhelmed by infected people. In June, the World Health Organization (WHO) and the U.S. Centers for Disease Control and Prevention (CDC) stopped counting cases and declared the outbreak a pandemic.[10]

Despite being informally called "swine flu", the H1N1 flu virus cannot be spread by eating pork or pork products;[11][12] similar to other influenza viruses, it is typically contracted by person to person transmission through respiratory droplets.[13] Symptoms usually last 4–6 days.[14] Antivirals (oseltamivir or zanamivir) were recommended for those with more severe symptoms or those in an at-risk group.[15]

The pandemic began to taper off in November 2009,[16] and by May 2010, the number of cases was in steep decline.[17][18][19][20] On 10 August 2010, the Director-General of the World Health Organization, Margaret Chan, announced the end of the H1N1 pandemic,[21] and announced that the H1N1 influenza event has moved into the post-pandemic period.[22] According to the latest WHO statistics (July 2010), the virus has killed more than 18,000 people since it appeared in April 2009, however they state that the total mortality (including deaths unconfirmed or unreported) from the H1N1 strain is "unquestionably higher".[17][23] Critics claimed the WHO had exaggerated the danger, spreading "fear and confusion" rather than "immediate information".[24] The WHO began an investigation to determine[25] whether it had "frightened people unnecessarily".[26] A flu followup study done in September 2010, found that "the risk of most serious complications was not elevated in adults or children."[27] In an August 5, 2011 PLoS ONE article, researchers estimated that the 2009 H1N1 global infection rate was 11% to 21%, lower than what was previously expected. [28] Serbia's B92 investigative reporting concluded that vaccine was not properly tested. [29]



The initial outbreak was called the "H1N1 influenza", or "Swine Flu" by American media. It is called pandemic H1N1/09 virus by the World Health Organization,[30] while the U.S. Centers for Disease Control and Prevention refer to it as "novel influenza A (H1N1)" or "2009 H1N1 flu".[31] In the Netherlands, it was originally called "Pig Flu", but is now called "New Influenza A (H1N1)" by the national health institute, although the media and general population use the name "Mexican Flu". South Korea and Israel briefly considered calling it the "Mexican virus".[32] Later, the South Korean press used "SI", short for "swine influenza". Taiwan suggested the names "H1N1 flu" or "new flu", which most local media adopted.[33] The World Organization for Animal Health proposed the name "North American influenza".[34] The European Commission adopted the term "novel flu virus".[35]

Signs and symptoms

The symptoms of H1N1 flu are similar to those of other influenzas, and may include a fever, cough (typically a "dry cough"), headache, muscle or joint pain, sore throat, chills, fatigue, and runny nose. Diarrhea, vomiting, and neurological problems have also been reported in some cases.[36][37] People at higher risk of serious complications include those aged over 65, children younger than 5, children with neurodevelopmental conditions, pregnant women (especially during the third trimester),[5][38] and those of any age with underlying medical conditions, such as asthma, diabetes, obesity, heart disease, or a weakened immune system (e.g., taking immunosuppressive medications or infected with HIV).[39] More than 70% of hospitalizations in the U.S. have been people with such underlying conditions, according to the CDC.[40]

In September 2009, the CDC reported that the H1N1 flu "seems to be taking a heavier toll among chronically ill children than the seasonal flu usually does."[8] Through 8 August 2009, the CDC had received 36 reports of paediatric deaths with associated influenza symptoms and laboratory-confirmed pandemic H1N1 from state and local health authorities within the United States, with 22 of these children having neurodevelopmental conditions such as cerebral palsy, muscular dystrophy, or developmental delays.[41] "Children with nerve and muscle problems may be at especially high risk for complications because they cannot cough hard enough to clear their airways".[8] From 26 April 2009, to 13 February 2010, the CDC had received reports of the deaths of 277 children with laboratory-confirmed 2009 influenza A (H1N1) within the United States.[42]

Symptoms in severe cases

The World Health Organization reports that the clinical picture in severe cases is strikingly different from the disease pattern seen during epidemics of seasonal influenza. While people with certain underlying medical conditions are known to be at increased risk, many severe cases occur in previously healthy people. In severe cases, patients generally begin to deteriorate around three to five days after symptom onset. Deterioration is rapid, with many patients progressing to respiratory failure within 24 hours, requiring immediate admission to an intensive care unit. Upon admission, most patients need immediate respiratory support with mechanical ventilation.[43]

A November 2009 CDC recommendation stated that the following constitute "emergency warning signs" and advised seeking immediate care if a person experiences any one of these signs:[44]

In adults:
  • Difficulty breathing or shortness of breath
  • Pain or pressure in the chest or abdomen
  • Sudden dizziness
  • Confusion
  • Severe or persistent vomiting
  • Low temperature
In children:
  • Fast breathing or working hard to breathe
  • Bluish skin color
  • Not drinking enough fluids
  • Not waking up or not interacting
  • Being so irritable that the child does not want to be held
  • Flu-like symptoms which improve but then return with fever and worse cough
  • Fever with a rash
  • Being unable to eat
  • Having no tears when crying

Research later indicated that the severe flu effects in healthy young and middle-aged adults are caused by an excessive immune response.[45]


Most complications have occurred among previously healthy individuals, with obesity and respiratory disease as the strongest risk factors. Pulmonary complications are common. Primary influenza pneumonia occurs most commonly in adults and may progress rapidly to acute lung injury requiring mechanical ventilation. Secondary bacterial infection is more common in children. Staphylococcus aureus, including methicillin-resistant strains, is an important cause of secondary bacterial pneumonia with a high mortality rate. Neuromuscular and cardiac complications are unusual but may occur.[46]

A United Kingdom investigation of risk factors for hospitalisation and poor outcome with pandemic A/H1N1 influenza looked at 631 patients from 55 hospitals admitted with confirmed infection from May through September 2009. 13% were admitted to a high dependency or intensive care unit and 5% died; 36% were aged <16 years and 5% were aged ≥65 years. Non-white and pregnant patients were over-represented. 45% of patients had at least one underlying condition, mainly asthma, and 13% received antiviral drugs before admission. Of 349 with documented chest x-rays on admission, 29% had evidence of pneumonia, but bacterial co-infection was uncommon. Multivariate analyses showed that physician-recorded obesity on admission and pulmonary conditions other than asthma or chronic obstructive pulmonary disease (COPD) were associated with a severe outcome, as were radiologically confirmed pneumonia and a raised C-reactive protein (CRP) level (≥100 mg/l). 59% of all in-hospital deaths occurred in previously healthy people.[47]

Fulminant (sudden-onset) myocarditis has been linked to infection with H1N1, with at least four cases of myocarditis confirmed in patients also infected with A/H1N1. Three out of the four cases of H1N1-associated myocarditis were classified as fulminant, and one of the patients died.[48] Also, there appears to be a link between severe A/H1N1 influenza infection and pulmonary embolism. In one report, five out of 14 patients admitted to the intensive care unit with severe A/H1N1 infection were found to have pulmonary emboli.[49]

An article published in JAMA in September 2010[50] challenged previous reports and stated that children infected in the 2009 flu pandemic were no more likely to be hospitalised with complications or get pneumonia than those who catch seasonal strains. Researchers found that about 1.5% of children with the H1N1 swine flu strain were hospitalised within 30 days, compared with 3.7% of those sick with a seasonal strain of H1N1 and 3.1% with an H3N2 virus.[27]


Confirmed diagnosis of pandemic H1N1 flu requires testing of a nasopharyngeal, nasal or oropharyngeal tissue swab from the patient.[51] Real-time RT-PCR is the recommended test as others are unable to differentiate between pandemic H1N1 and regular seasonal flu.[51] However, most people with flu symptoms do not need a test for pandemic H1N1 flu specifically, because the test results usually do not affect the recommended course of treatment.[52] The U.S. CDC recommend testing only for people who are hospitalised with suspected flu, pregnant women and people with weakened immune systems.[52] For the mere diagnosis of influenza and not pandemic H1N1 flu specifically, more widely available tests include rapid influenza diagnostic tests (RIDT), which yield results in about 30 minutes, and direct and indirect immunofluorescence assays (DFA and IFA), which take 2–4 hours.[53] Due to the high rate of RIDT false negatives, the CDC advises that patients with illnesses compatible with novel influenza A (H1N1) virus infection but with negative RIDT results should be treated empirically based on the level of clinical suspicion, underlying medical conditions, severity of illness and risk for complications, and if a more definitive determination of infection with influenza virus is required, testing with rRT-PCR or virus isolation should be performed.[54] Dr. Rhonda Medows of the Georgia Department of Community Health states that the rapid tests are incorrect anywhere from 30% to 90% of the time and warns doctors in her state not to use them because they are wrong so often.[55] The use of RIDTs has also been questioned by researcher Paul Schreckenberger of the Loyola University Health System, who suggests that rapid tests may actually pose a dangerous public health risk.[56] Dr. Nikki Shindo of the WHO has expressed regret at reports of treatment being delayed by waiting for H1N1 test results and suggests, "[D]octors should not wait for the laboratory confirmation but make diagnosis based on clinical and epidemiological backgrounds and start treatment early".[57]

On 22 June 2010, the CDC announced a new test called the "CDC Influenza 2009 A (H1N1)pdm Real-Time RT-PCR Panel (IVD)". It uses a molecular biology technique to detect influenza A viruses and specifically the 2009 H1N1 virus. The new test will replace the previous real-time RT-PCR diagnostic test used during the 2009 H1N1 pandemic, which received an emergency use authorisation from the U.S. Food and Drug Administration in April 2009. Tests results are available in four hours and are 96% accurate.[58]

Virus characteristics

The virus was found to be a novel strain of influenza for which extant vaccines against seasonal flu provided little protection. A study at the U.S. Centers for Disease Control and Prevention published in May 2009 found that children had no preexisting immunity to the new strain but that adults, particularly those over 60, had some degree of immunity. Children showed no cross-reactive antibody reaction to the new strain, adults aged 18 to 64 had 6–9%, and older adults 33%.[59][60] While it has been thought that these findings suggest the partial immunity in older adults may be due to previous exposure to similar seasonal influenza viruses, a November 2009 study of a rural unvaccinated population in China found only a 0.3% cross-reactive antibody reaction to the H1N1 strain, suggesting that previous vaccinations for seasonal flu and not exposure may have resulted in the immunity found in the older U.S. population.[61]

It has been determined that the strain contains genes from five different flu viruses: North American swine influenza, North American avian influenza, human influenza and two swine influenza viruses typically found in Asia and Europe. Further analysis has shown that several proteins of the virus are most similar to strains that cause mild symptoms in humans, leading virologist Wendy Barclay to suggest on 1 May 2009, that the initial indications are that the virus was unlikely to cause severe symptoms for most people.[62]

The virus is currently less lethal than previous pandemic strains and kills about 0.01–0.03% of those infected; the 1918 influenza was about one hundred times more lethal and had a case fatality rate of 2–3%.[63] By 14 November 2009, the virus had infected one in six Americans with 200,000 hospitalisations and 10,000 deaths – as many hospitalizations and fewer deaths than in an average flu season overall, but with much higher risk for those under 50. With deaths of 1,100 children and 7,500 adults 18 to 64, these figures "are much higher than in a usual flu season".[64]

In June 2010, scientists from Hong Kong reported discovery of a new swine flu virus which is a hybrid of the pandemic H1N1 virus and viruses previously found in pigs. It is the first report of a reassortment of the pandemic virus, which in humans has been slow to evolve. Nancy Cox, head of the influenza division at the U.S. Centers for Disease Control and Prevention, has said, "This particular paper is extremely interesting because it demonstrates for the first time what we had worried about at the very onset of the pandemic, and that is that this particular virus, when introduced into pigs, could reassort with the resident viruses in pigs and we would have new gene constellations. And bingo, here we are." Pigs have been termed the mixing vessel of flu because they can be infected both by avian flu viruses, which rarely directly infect people, and by human viruses. When pigs become simultaneously infected with more than one virus, the viruses can swap genes, producing new variants which can pass to humans and sometimes spread amongst them.[65] "Unlike the situation with birds and humans, we have a situation with pigs and humans where there's a two-way street of exchange of viruses. With pigs it's very much a two-way street".[66]


Spread of the H1N1 virus is thought to occur in the same way that seasonal flu spreads. Flu viruses are spread mainly from person to person through coughing or sneezing by people with influenza. Sometimes people may become infected by touching something – such as a surface or object – with flu viruses on it and then touching their face. "Avoid touching your eyes, nose or mouth. Germs spread this way".[11]

The basic reproduction number (the average number of other individuals whom each infected individual will infect, in a population which has no immunity to the disease) for the 2009 novel H1N1 is estimated to be 1.75.[67] A December 2009 study found that the transmissibility of the H1N1 influenza virus in households is lower than that seen in past pandemics. Most transmissions occur soon before or after the onset of symptoms.[68]

The H1N1 virus has been transmitted to animals, including swine, turkeys, ferrets, household cats, at least one dog and a cheetah.[69][70][71][72]


The H1N1 vaccine was initially in short supply and in the U.S., the CDC recommended that initial doses should go to priority groups such as pregnant women, people who live with or care for babies under six months old, children six months to four years old and health-care workers.[73] In the UK, the NHS recommended vaccine priority go to people over six months old who were clinically at risk for seasonal flu, pregnant women and households of people with compromised immunity.[74]

Although it was initially thought that two injections would be required, clinical trials showed that the new vaccine protected adults "with only one dose instead of two", and so the limited vaccine supplies would go twice as far as had been predicted.[75][76] Health officials worldwide were also concerned because the virus was new and could easily mutate and become more virulent, even though most flu symptoms were mild and lasted only a few days without treatment. Officials also urged communities, businesses and individuals to make contingency plans for possible school closures, multiple employee absences for illness, surges of patients in hospitals and other effects of potentially widespread outbreaks.[77]

In February 2010, the CDC's Advisory Committee on Immunization Practices voted for "universal" flu vaccination in the U.S. to include all people over six months of age. The 2010–2011 vaccine will protect against the 2009 H1N1 pandemic virus and two other flu viruses.[78]

Public health response

  5,000+ confirmed cases
  500+ confirmed cases
  50+ confirmed cases
  5+ confirmed cases
  1+ confirmed cases

On 27 April 2009, the European Union health commissioner advised Europeans to postpone nonessential travel to the United States or Mexico. This followed the discovery of the first confirmed case in Spain.[79] On 6 May 2009, the Public Health Agency of Canada announced that their National Microbiology Laboratory (NML) had mapped the genetic code of the swine flu virus, the first time that had been done.[80] In the U.K., the National Health Service launched a website, the National Pandemic Flu Service,[81] allowing patients to self-assess and get an authorisation number for antiviral medication. The system was expected to reduce the burden on general practitioners.[74]

U.S. officials observed that six years of concern about H5N1 avian flu did much to prepare for the current H1N1 flu outbreak, noting that after H5N1 emerged in Asia, ultimately killing about 60% of the few hundred people infected by it over the years, many countries took steps to try to prevent any similar crisis from spreading further.[82] The CDC and other American governmental agencies[83] used the summer lull to take stock of the United States' response to H1N1 flu and attempt to patch any gaps in the public health safety net before flu season started in early autumn.[84] Preparations included planning a second influenza vaccination program in addition to that for seasonal influenza, and improving coordination between federal, state and local governments and private health providers.[84] On 24 October 2009, U.S. President Obama declared swine flu a national emergency, giving Secretary of Health and Human Services Kathleen Sebelius authority to grant waivers to requesting hospitals from usual federal requirements.[85]


U.S. President Barack Obama being vaccinated against H1N1 flu on 20 December 2009.

As of 19 November 2009 (2009 -11-19), over 65 million doses of vaccine had been administered in over 16 countries; the vaccine seems safe and effective, producing a strong immune response that should protect against infection.[86] Whereas the 2009 trivalent seasonal influenza vaccine neither increases nor decreases the risk of infection with H1N1, the vaccines rushed to combat the new strain are effective against H1N1,[87][88] although they are manufactured similarly. Overall the safety profile of the new H1N1 vaccine is similar to that of the seasonal flu vaccine, and as of November 2009 fewer than a dozen cases of Guillain-Barre syndrome had been reported post-vaccination.[89] Only a few of these were suspected to be actually related to the H1N1 vaccination, and only temporary illness had been observed.[89] This is in strong contrast to the 1976 swine flu outbreak, when mass vaccinations in the United States caused over 500 cases of Guillain-Barre syndrome and led to 25 deaths.[90] Although the vaccines were effective, many industrialised nations were giving away, selling, canceling orders for and destroying excess doses of the vaccine.[91][92]

There are safety concerns for people who are allergic to eggs because the viruses for the vaccine are grown in chicken-egg-based cultures. People with egg allergies may be able to receive the vaccine, after consultation with their physician, in graded doses in a careful and controlled environment.[93] A vaccine manufactured by Baxter is made without using eggs, but requires two doses three weeks apart to produce immunity.[94]

As of late November 2009, in Canada there had been 24 confirmed cases of anaphylactic shock following vaccination, including one death. The estimated rate is one anaphylactic reaction per 312,000 persons receiving the vaccine; however, six persons had suffered anaphylaxis out of 157,000 doses given from one batch of vaccine. Dr. David Butler-Jones, Canada's chief public health officer, stated that even though this was an adjuvanted vaccine, that did not appear to be the cause of this severe allergic reaction in these six patients.[95][96]

Accusations of conflict of interest

In January 2010, Wolfgang Wodarg, a German deputy who trained as a physician and now chairs the health committee at the Council of Europe, claimed major firms had organised a "campaign of panic" to put pressure on the World Health Organisation (WHO) to declare a "false pandemic" to sell vaccines. Wodarg said the WHO's "false pandemic" flu campaign is "one of the greatest medicine scandals of the century". He said that the "false pandemic" campaign began last May in Mexico City, when a hundred or so "normal" reported influenza cases were declared to be the beginning of a threatening new pandemic, although he said there was little scientific evidence for this. Nevertheless he argued that the WHO, "in cooperation with some big pharmaceutical companies and their scientists, re-defined pandemics", removing the statement that "an enormous amount of people have contracted the illness or died" from its existing definition and replacing it by stating simply that there has to be a virus, spreading beyond borders and to which people have no immunity.[97] The WHO responded by stating that they take their duty to provide independent advice seriously and guarded against interference from outside interests. Announcing a review of the WHO's actions, spokeswoman Fadela Chaib stated: "Criticism is part of an outbreak cycle. We expect and indeed welcome criticism and the chance to discuss it".[98][99] In March 2010, the Council of Europe launched an enquiry into "the influence of the pharmaceutical companies on the global swine flu campaign", and a preliminary report is in preparation.[100]

On 12 April 2010, Keiji Fukuda, the WHO's top influenza expert, stated that the system leading to the declaration of a pandemic led to confusion about H1N1 circulating around the world, and he expressed concern that there was a failure to communicate in regard to uncertainties about the new virus, which turned out to be not as deadly as feared. WHO Director-General Margaret Chan has appointed 29 flu experts from outside the organization to conduct a review of WHO's handling of the H1N1 flu pandemic. She has told them, "We want a frank, critical, transparent, credible and independent review of our performance".[101]

In June 2010, Fiona Godlee, editor-in-chief of the BMJ, published an editorial which criticised the WHO, saying that an investigation had disclosed that some of the experts advising WHO on the pandemic had financial ties with drug companies which were producing antivirals and vaccines.[102] Margaret Chan, Director-General of the WHO, replied stating, "Without question, the BMJ feature and editorial will leave many readers with the impression that WHO's decision to declare a pandemic was at least partially influenced by a desire to boost the profits of the pharmaceutical industry. The bottom line, however, is that decisions to raise the level of pandemic alert were based on clearly defined virological and epidemiological criteria. It is hard to bend these criteria, no matter what the motive".[101] In August 2010, the Daily Mail printed an article stating that "a third of the experts advising the World Health Organisation about the swine flu pandemic had ties to drugs firms" and that of the 20 members of the Scientific Advisory Group for Emergencies, which advised the British Government on swine flu, 11 had done work for the pharmaceutical industry or were linked to it through their universities.[103]

Infection control

Travel precautions

Flu inspection on a flight arriving in China
Thermal imaging camera and screen, photographed in an airport terminal in Greece. Thermal imaging can detect elevated body temperature, one of the signs of swine flu.

On 7 May 2009, the WHO stated that containment was not feasible and that countries should focus on mitigating the effect of the virus. They did not recommend closing borders or restricting travel.[104] On 26 April 2009, the Chinese government announced that visitors returning from flu-affected areas who experienced flu-like symptoms within two weeks would be quarantined.[105]

U.S. airlines had made no major changes as of the beginning of June 2009, but continued standing practices which include looking for passengers with symptoms of flu, measles or other infections, and relying on in-flight air filters to ensure that aircraft were sanitised.[106] Masks were not generally provided by airlines and the CDC did not recommend that airline crews wear them.[106] Some non-U.S. airlines, mostly Asian, including Singapore Airlines, China Eastern Airlines, China Southern Airlines, Cathay Pacific and Mexicana Airlines, took measures such as stepping up cabin cleaning, installing state-of-the-art air filters and allowing in-flight staff to wear face masks.[106]


U.S. government officials have been especially concerned about schools because the H1N1 flu virus appears to disproportionately affect young and school-age people, between six months and 24 years of age.[107] The H1N1 outbreak led to numerous precautionary school closures in some areas. Rather than closing schools, the CDC recommended that students and school workers with flu symptoms should stay home for either seven days total, or until 24 hours after symptoms subsided, whichever was longer.[108] The CDC also recommended that colleges should consider suspending fall 2009 classes if the virus began to cause severe illness in a significantly larger share of students than the previous spring. They also urged schools to suspend rules, such as penalties for late papers or missed classes or requirements for a doctor's note, to enforce "self-isolation" and prevent students from venturing out while ill;[109] schools were advised to set aside a room for people developing flu-like symptoms while they waited to go home and to have ill students or staff and those caring for them use face masks.[110]

In California, school districts and universities were on alert and working with health officials to launch education campaigns. Many planned to stockpile medical supplies and discuss worst-case scenarios, including plans to provide lessons and meals for low-income children in case elementary and secondary schools closed.[111] University of California campuses stockpiled supplies, from paper masks and hand sanitizer to food and water.[111] To help prepare for contingencies, University of Maryland School of Medicine professor of pediatrics James C. King Jr. suggested that every county should create an "influenza action team" to be run by the local health department, parents and school administrators.[112] As of 28 October 2009 (2009 -10-28), about 600 schools in the United States had been temporarily closed, affecting over 126,000 students in 19 states.[113]


Fearing a worst-case scenario, the U.S. Department of Health and Human Services (HHS), the Centers for Disease Control and Prevention and the Department of Homeland Security (DHS) developed updated guidance[114] and a video for employers to use as they developed plans to respond to the H1N1 outbreak. The guidance suggested that employers consider and communicate their objectives, such as reducing transmission among staff, protecting people who are at increased risk of influenza-related complications from becoming infected, maintaining business operations, and minimising adverse effects on other entities in their supply chains.[114]

The CDC estimated that as much as 40% of the workforce might be unable to work at the peak of the pandemic due to the need for many healthy adults to stay home and care for an ill family member,[115] and advised that individuals should have steps in place should a workplace close down or a situation arise that requires working from home.[116] The CDC further advised that persons in the workplace should stay home sick for seven days after getting the flu, or 24 hours after symptoms end, whichever is longer.[108]

In the UK, the Health and Safety Executive (HSE) also issued general guidance for employers.[117]

Facial masks

The U.S. CDC does not recommend use of face masks or respirators in non-health care settings, such as schools, workplaces, or public places, with a few exceptions: people who are ill with the virus when around other people, and people who are at risk for severe illness while caring for someone with the flu.[118] There has been some disagreement about the value of wearing facial masks, some experts fearing that masks may give people a false sense of security and should not replace other standard precautions.[119] Masks may benefit people in close contact with infected persons, but it is unknown whether they prevent H1N1 flu infection.[119] Yukihiro Nishiyama, professor of virology at Nagoya University's School of Medicine, commented that the masks are "better than nothing, but it's hard to completely block out an airborne virus since it can easily slip through the gaps".[120]

According to mask manufacturer 3M, masks will filter out particles in industrial settings, but "there are no established exposure limits for biological agents such as swine flu virus".[119] However, despite the lack of evidence of effectiveness, the use of such masks is common in Asia.[120][121] They are particularly popular in Japan, where cleanliness and hygiene are highly valued and where etiquette obligates those who are sick to wear masks to avoid spreading disease.[120]


During the height of the fear of a pandemic, some countries initiated or threatened to initiate quarantines of foreign visitors suspected of having or being in contact with others who may have been infected. In May 2009, the Chinese government confined 21 U.S. students and three teachers to their hotel rooms.[122] As a result, the US State Department issued a travel alert about China's anti-flu measures and warned travellers against travelling to China if ill.[123] In Hong Kong, an entire hotel was quarantined with 240 guests;[124] Australia ordered a cruise ship with 2,000 passengers to stay at sea because of a swine flu threat.[125] Egyptian Muslims who went on the annual pilgrimage to Mecca risked being quarantined upon their return.[126] Russia and Taiwan said they would quarantine visitors with fevers who come from areas where the flu was present.[127] Japan quarantined 47 airline passengers in a hotel for a week in mid-May,[128] then in mid-June India suggested pre-screening "outbound" passengers from countries thought to have a high rate of infection.[129]

Pigs and food safety

The pandemic virus is a type of swine influenza, derived originally from a strain which lived in pigs, and this origin gave rise to the common name of "swine flu". This term is widely used by mass media. The virus has been found in American hogs,[130] and Canadian[131] as well as in hogs in Northern Ireland, Argentina, and Norway.[132] Leading health agencies and the United States Secretary of Agriculture have stressed that eating properly cooked pork or other food products derived from pigs will not cause flu.[133][134] Nevertheless, on 27 April, Azerbaijan imposed a ban on the importation of animal husbandry products from America.[135] The Indonesian government also halted the importation of pigs and initiated the examination of 9 million pigs in Indonesia.[136] The Egyptian government ordered the slaughter of all pigs in Egypt on 29 April 2009.[137]


A number of methods have been recommended to help ease symptoms, including adequate liquid intake and rest.[138] Over-the-counter pain medications such as acetaminophen and ibuprofen do not kill the virus; however, they may be useful to reduce symptoms.[139] Aspirin and other salicylate products should not be used by people under 19 with any flu-type symptoms because of the risk of developing Reye's Syndrome.[140]

If the fever is mild and there are no other complications, fever medication is not recommended.[139] Most people recover without medical attention, although those with pre-existing or underlying medical conditions are more prone to complications and may benefit from further treatments.[44]

People in at-risk groups should be treated with antivirals (oseltamivir or zanamivir) as soon as possible when they first experience flu symptoms. The at-risk groups include pregnant and post partum women, children under two years old, and people with underlying conditions such as respiratory problems.[15] People who are not in an at-risk group who have persistent or rapidly worsening symptoms should also be treated with antivirals. People who have developed pneumonia should be given both antivirals and antibiotics, as in many severe cases of H1N1-caused illness, bacterial infection develops.[57] Antivirals are most useful if given within 48 hours of the start of symptoms and may improve outcomes in hospitalised patients.[141] In those beyond 48 hours who are moderately or severely ill, antivirals may still be beneficial.[13] If oseltamivir (Tamiflu) is unavailable or cannot be used, zanamivir (Relenza) is recommended as a substitute.[15][142] Peramivir is an experimental antiviral drug approved for hospitalised patients in cases where the other available methods of treatment are ineffective or unavailable.[143]

To help avoid shortages of these drugs, the U.S. CDC recommended oseltamivir treatment primarily for people hospitalised with pandemic flu; people at risk of serious flu complications due to underlying medical conditions; and patients at risk of serious flu complications. The CDC warned that the indiscriminate use of antiviral medications to prevent and treat influenza could ease the way for drug-resistant strains to emerge, which would make the fight against the pandemic that much harder. In addition, a British report found that people often failed to complete a full course of the drug or took the medication when not needed.[144]

Side effects

Both medications have known side effects, including lightheadedness, chills, nausea, vomiting, loss of appetite and trouble breathing. Children were reported to be at increased risk of self-injury and confusion after taking oseltamivir.[138] The WHO warn against buying antiviral medications from online sources, and estimate that half the drugs sold by online pharmacies without a physical address are counterfeit.[145]


As of December 2010, the World Health Organization (WHO) reported 314 samples of the 2009 pandemic H1N1 flu tested worldwide have shown resistance to oseltamivir (Tamiflu).[146] This is not totally unexpected as 99.6% of the seasonal H1N1 flu strains tested have developed resistance to oseltamivir.[147] No circulating flu has yet shown any resistance to zanamivir (Relenza), the other available anti-viral.[148]

Effectiveness of antivirals questioned

On 8 December 2009, the Cochrane Collaboration, which reviews medical evidence, announced in a review published in BMJ that it had reversed its previous findings that the antiviral drugs oseltamivir (Tamiflu) and zanamivir (Relenza) can ward off pneumonia and other serious conditions linked to influenza. They reported that an analysis of 20 studies showed oseltamivir offered mild benefits for healthy adults if taken within 24 hours of onset of symptoms, but found no clear evidence it prevented lower respiratory tract infections or other complications of influenza.[149][150] Their published finding relates only to its use in healthy adults with influenza; they say nothing about its use in patients judged to be at high risk of complications (pregnant women, children under five and those with underlying medical conditions), and uncertainty over its role in reducing complications in healthy adults may still leave it as a useful drug for reducing the duration of symptoms. The drugs might eventually be demonstrated to be effective against flu-related complications; in general, the Cochrane Collaboration concluded "Paucity of good data".[150][151]

Some specific results from the BMJ article include: "The efficacy of oral oseltamivir against symptomatic laboratory confirmed influenza was 61% (risk ratio 0.39, 95% confidence interval 0.18 to 0.85) at 75 mg daily ... The remaining evidence suggests oseltamivir did not reduce influenza related lower respiratory tract complications (risk ratio 0.55, 95% confidence interval 0.22 to 1.35)".[150] Notice especially the wide range for this second result.


While it is not known precisely where or when the virus originated,[153][154] analyses in scientific journals have suggested that the H1N1 strain responsible for the current outbreak first evolved in September 2008 and circulated amongst humans for several months before being formally recognised and identified as a novel strain of influenza.[153][155]


The virus was first reported in two U.S. children in March 2009, but health officials have reported that it apparently infected people as early as January 2009 in Mexico.[156] The outbreak was first detected in Mexico City on 18 March 2009;[157] immediately after the outbreak was officially announced, Mexico notified the U.S. and World Health Organization, and within days of the outbreak Mexico City was "effectively shut down".[158] Some countries cancelled flights to Mexico while others halted trade. Calls to close the border to contain the spread were rejected.[158] Mexico already had hundreds of non-lethal cases before the outbreak was officially discovered, and was therefore in the midst of a "silent epidemic". As a result, Mexico was reporting only the most serious cases which showed more severe signs different from those of normal flu, possibly leading to a skewed initial estimate of the case fatality rate.[157]

United States

The new strain was first identified by the CDC in two children, neither of whom had been in contact with pigs. The first case, from San Diego County, California, was confirmed from clinical specimens (nasopharyngeal swab) examined by the CDC on 14 April 2009. A second case, from nearby Imperial County, California, was confirmed on 17 April. The patient in the first confirmed case had flu symptoms including fever and cough on clinical examination on 30 March, and the second on 28 March.[159]

The first confirmed H1N1/09 pandemic flu death, which occurred at Texas Children's Hospital in Houston, Texas, was of a toddler from Mexico City who was visiting family in Brownsville, Texas, before being air-lifted to Houston for treatment.[160]

Data reporting and accuracy

Influenza surveillance information "answers the questions of where, when, and what influenza viruses are circulating. It can be used to determine if influenza activity is increasing or decreasing, but cannot be used to ascertain how many people have become ill with influenza".[161] For example, as of late June 2009, influenza surveillance information showed the U.S. had nearly 28,000 laboratory-confirmed cases including 3,065 hospitalisations and 127 deaths; but mathematical modelling showed an estimated 1 million Americans currently had the 2009 pandemic flu, according to Lyn Finelli, a flu surveillance official with the CDC.[162] Estimating deaths from influenza is also a complicated process. In 2005, influenza only appeared on the death certificates of 1,812 people in the US. The average annual US death toll from flu is, however, estimated to be 36,000.[163] The CDC explains:[164] "[I]nfluenza is infrequently listed on death certificates of people who die from flu-related complications" and hence, "Only counting deaths where influenza was included on a death certificate would be a gross underestimation of influenza's true impact".

With respect to the current H1N1 flu pandemic, influenza surveillance information is available but almost no studies have attempted to estimate the total number of deaths attributable to H1N1 flu. Two studies have been performed by the CDC, however; the most recent estimates that there were 9,820 deaths (range 7,070–13,930) attributable to H1N1 flu from April to 14 November 2009.[165] During the same period, 1642 deaths were officially confirmed as caused by H1N1 flu.[166][167] The WHO state that total mortality (including deaths unconfirmed or unreported) from H1N1 flu is "unquestionably higher" than their own confirmed death statistics.[168]

The initial outbreak received a week of near-constant media attention. Epidemiologists cautioned that the number of cases reported in the early days of an outbreak can be very inaccurate and deceptive due to several causes, among them selection bias, media bias and incorrect reporting by governments. Inaccuracies could also be caused by authorities in different countries looking at differing population groups. Furthermore, countries with poor health care systems and older laboratory facilities may take longer to identify or report cases.[169] "[E]ven in developed countries the [numbers of flu deaths] are uncertain, because medical authorities don't usually verify who actually died of influenza and who died of a flu-like illness".[170] Dr. Joseph S. Bresee (the CDC flu division's epidemiology chief) and Dr. Michael Osterholm (director of the Center for Infectious Disease Research and Policy) have pointed out that millions of people have had H1N1 flu, usually in a mild form, so the numbers of laboratory-confirmed cases were actually meaningless, and in July 2009 the WHO stopped keeping count of individual cases and focused more on major outbreaks.[171]


A Wisconsin study published in the Journal of the American Medical Association in September 2010, reported that findings showed that the 2009 H1N1 flu was no more severe than the seasonal flu. "The risk of most serious complications was not elevated in adults or children", the study's authors wrote. "Children were disproportionately affected by 2009 H1N1 infection, but the perceived severity of symptoms and risk of serious outcomes were not increased." Children infected in the 2009 H1N1 flu pandemic were no more likely to be hospitalized with complications or get pneumonia than those who catch seasonal strains. About 1.5% of children with the H1N1 swine flu strain were hospitalized within 30 days, compared with 3.7% of those sick with a seasonal strain of H1N1 and 3.1% with an H3N2 virus.[172]

CDC illness and death estimates from April 2009 to April 2010, are as follows:

  • CDC estimates that between 43 million and 89 million cases of 2009 H1N1 occurred between April 2009 and 10 April 2010. The mid-level in this range is about 61 million people infected with 2009 H1N1.
  • CDC estimates that between about 195,000 and 403,000 H1N1-related hospitalizations occurred between April 2009 and 10 April 2010. The mid-level in this range is about 274,000 2009 H1N1-related hospitalizations.
  • CDC estimates that between about 8,870 and 18,300 2009 H1N1-related deaths occurred between April 2009 and 10 April 2010. The mid-level in this range is about 12,470 2009 H1N1-related deaths.[173]

It is often stated that about 36,000 die from the seasonal flu in the U.S. each year,[174] and this is frequently understood as an indication that the H1N1 strain was not as severe as seasonal influenza. The 36,000 estimate was presented in a 2003 study by CDC scientists published in the Journal of the American Medical Association but only refers to a period from 1990-91 through 1998-99. During those years, the number of estimated deaths ranged from 17,000 to 52,000, with an average of about 36,000. The JAMA study also looked at seasonal influenza-associated deaths over a 23 year period, from 1976-1977 and 1998-1999. During that period, estimates of respiratory and circulatory influenza-associated deaths ranged from about 5,000 to about 52,000, with an average of about 25,000. While the 36,000 number is often cited, it's important to note that during that decade, influenza A (H3N2) was the predominant virus during most of the seasons, and H3N2 influenza viruses are typically associated with higher death rates. CDC believes that the range of deaths over the past 31 years (~3,000 to ~49,000) is a more accurate representation of the unpredictability and variability of flu-associated deaths.[175] The annual toll from seasonal influenza in the US is more accurately estimated at 3000-49,000 deaths per year. So the H1N1 pandemic estimated mortality of 8,870 to 18,300, places it in the mid-range of estimates.[176]

The 2009 pandemic caused hospitals around the country to make significant preparations in terms of hospital surge capacities, especially within the emergency department and among vulnerable populations. In many cases, hospitals were relatively successful in making sure that those patients most severely affected by the influenza strain were able to be seen, treated, and discharged in an efficient manner. A proper case-study of the preparation, planning, mitigation, and response efforts during the Fall of 2009 is that of the Children's Hospital of Philadelphia (CHOP). For example, CHOP took several steps to increase the emergency department (ED) surge capacity response abilities through careful planning and mitigation efforts. To increase ED capacity and response, CHOP used portions of the main lobby area as an ED waiting room; several of the region's hospital-based outpatient facilities were in use during evening and weekend hours for non-emergent cases; the ED's 24-hour short-stay unit was utilized to care for ED patients in a longer-term capacity; non-board certified physicians (in pediatric emergency medicine) and inpatient-unit medical nurses were utilized for ED patient care; hospital units normally utilized for other medical or therapeutic purposes were transformed into ED patient rooms; and rooms normally used for only one patient were expanded to at least a capacity of 2[177]

Comparisons to other pandemics and epidemics

Annual influenza epidemics are estimated to affect 5–15% of the global population. Although most cases are mild, these epidemics still cause severe illness in 3–5 million people and 250,000–500,000 deaths worldwide.[178] On average 41,400 people die of influenza-related illnesses each year in the United States, based on data collected between 1979 and 2001.[179] In industrialised countries, severe illness and deaths occur mainly in the high-risk populations of infants, the elderly and chronically ill patients,[178] although the H1N1 flu outbreak (like the 1918 Spanish flu) differs in its tendency to affect younger, healthier people.[180]

In addition to these annual epidemics, Influenza A virus strains caused three global pandemics during the 20th century: the Spanish flu in 1918, Asian flu in 1957, and Hong Kong flu in 1968–69. These virus strains had undergone major genetic changes for which the population did not possess significant immunity.[181] Recent genetic analysis has revealed that three-quarters, or six out of the eight genetic segments, of the 2009 flu pandemic strain arose from the North American swine flu strains circulating since 1998, when a new strain was first identified on a factory farm in North Carolina, and which was the first-ever reported triple-hybrid flu virus.[182]

The 1918 flu epidemic began with a wave of mild cases in the spring, followed by more deadly waves in the autumn, eventually killing hundreds of thousands in the United States.[183] The great majority of deaths in the 1918 flu pandemic were the result of secondary bacterial pneumonia. The influenza virus damaged the lining of the bronchial tubes and lungs of victims, allowing common bacteria from the nose and throat to infect their lungs. Subsequent pandemics have had many fewer fatalities due to the development of antibiotic medicines which can treat pneumonia.[184]

20th century flu pandemics
Pandemic Year Influenza virus type People infected (approximate) Estimated deaths worldwide Case fatality rate
Spanish flu 1918–1919 A/H1N1[185] 33% (500 million)[186] 20–100 million[187][188][189] >2.5%[190]
Asian flu 1956–1958 A/H2N2[185] ? 2 million[189] <0.1%[190]
Hong Kong flu 1968–1969 A/H3N2[185] ? 1 million[189] <0.1%[190]
Seasonal flu[t 1] Every year mainly A/H3N2, A/H1N1, and B 5–15% (340 million – 1 billion)[191] 250,000–500,000 per year[178] <0.1%[192]
Swine flu 2009–2010 Pandemic H1N1/09 > 622,482 (lab-confirmed)[193] 14,286 (lab-confirmed;[t 2] ECDC)[152]
18,036 (lab-confirmed;[t 2] WHO)[17]
  1. ^ Not necessarily pandemic, but included for comparison purposes.
  2. ^ a b The ratio of confirmed deaths to total deaths due to pandemic H1N1/09 flu is unknown. For more information, see "Data reporting and accuracy".

The influenza virus has also caused several pandemic threats over the past century, including the pseudo-pandemic of 1947 (thought of as mild because although globally distributed, it caused relatively few deaths),[181] the 1976 swine flu outbreak and the 1977 Russian flu, all caused by the H1N1 subtype.[181] The world has been at an increased level of alert since the SARS epidemic in Southeast Asia (caused by the SARS coronavirus).[195] The level of preparedness was further increased and sustained with the advent of the H5N1 bird flu outbreaks because of H5N1's high fatality rate, although the strains currently prevalent have limited human-to-human transmission (anthroponotic) capability, or epidemicity.[196]

People who contracted flu before 1957 appeared to have some immunity to H1N1 flu. Dr. Daniel Jernigan, head of flu epidemiology for the U.S. CDC, has stated: "Tests on blood serum from older people showed that they had antibodies that attacked the new virus ... That does not mean that everyone over 52 is immune, since Americans and Mexicans older than that have died of the new flu".[197]

See also

  • 2009 flu deaths by region
  • Health crisis


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