Henipavirus


Henipavirus
Henipaviruses
Virus classification
Group: Group V ((-)ssRNA)
Order: Mononegavirales
Family: Paramyxoviridae
Genus: Henipavirus
Type species
Hendra virus
Species

Nipah virus

Henipavirus is a genus of the family Paramyxoviridae, order Mononegavirales containing two established species, Hendra virus and Nipah virus. The henipaviruses are naturally harboured by Pteropid fruit bats (flying foxes), and some microbat species.[1] Henipavirus is characterised by a large genome, a wide host range, and their recent emergence as zoonotic pathogens capable of causing illness and death in domestic animals and humans.[2]

In 2009, RNA sequences of three novel viruses in phylogenetic relationship to known Henipaviruses were detected in Eidolon helvum (the African Straw-coloured fruit bat) in Ghana. The finding of these novel putative Henipaviruses outside Australia and Asia indicates that the region of potential endemicity of Henipaviruses extends to Africa.[3]


Contents

Virus structure

Structure of henipaviruses
The henipavirus genome (3’ to 5’ orientation) and products of the P gene

Henipaviruses are pleomorphic (variably shaped), ranging in size from 40 to 600 nm in diameter.[4] They possess a lipid membrane overlying a shell of viral matrix protein. At the core is a single helical strand of genomic RNA tightly bound to N (nucleocapsid) protein and associated with the L (large) and P (phosphoprotein) proteins which provide RNA polymerase activity during replication.

Embedded within the lipid membrane are spikes of F (fusion) protein trimers and G (attachment) protein tetramers. The function of the G protein is to attach the virus to the surface of a host cell via EFNB2, a highly conserved protein present in many mammals.[5][6] The F protein fuses the viral membrane with the host cell membrane, releasing the virion contents into the cell. It also causes infected cells to fuse with neighbouring cells to form large, multinucleated syncytia.

Genome structure

As with all viruses in the Mononegavirales order, the Hendra virus and Nipah virus genomes are non-segmented, single-stranded negative-sense RNA. Both genomes are 18.2 kb in size and contain six genes corresponding to six structural proteins.[7]

In common with other members of the Paramyxovirinae subfamily, the number of nucleotides in the henipavirus genome is a multiple of six, consistent with what is known as the 'rule of six'. Deviation from the rule of six, through mutation or incomplete genome synthesis, leads to inefficient viral replication, probably due to structural constraints imposed by the binding between the RNA and the N protein.

Henipaviruses employ an unusual process called RNA editing to generate multiple proteins from a single gene. The specific process in henipaviruses involves the insertion of extra guanosine residues into the P gene mRNA prior to translation. The number of residues added determines whether the P, V or W proteins are synthesised. The functions of the V and W proteins are unknown, but they may be involved in disrupting host antiviral mechanisms.

Hendra virus

Emergence

Hendra virus (originally Equine morbillivirus) was discovered in September 1994 when it caused the deaths of thirteen horses, and a trainer at a training complex in Hendra, a suburb of Brisbane in Queensland, Australia.[8]

The index case, a mare, was housed with 19 other horses after falling ill, and died two days later. Subsequently, all of the horses became ill, with 13 dying. The remaining 6 animals were subsequently euthanised as a way of preventing relapsing infection and possible further transmission.[9] Both the trainer, Victory ('Vic') Rail, and a stable hand were involved in nursing the index case and both fell ill within one week of the horse’s death with an influenza-like illness. The stable hand recovered while Mr Rail died of respiratory and renal failure. The source of the virus was most likely frothy nasal discharge from the index case.

A second outbreak occurred in August 1994 (chronologically preceding the first outbreak) in Mackay 1,000 km north of Brisbane resulting in the deaths of two horses and their owner.[10] The owner, Mark Preston, assisted in necropsies of the horses and within three weeks was admitted to hospital suffering from meningitis. Mr Preston recovered, but 14 months later developed neurologic signs and died. This outbreak was diagnosed retrospectively by the presence of Hendra virus in the brain of the patient.[11]

A survey of wildlife in the outbreak areas was conducted, and identified pteropid fruit bats as the most likely source of Hendra virus, with a seroprevalence of 47%. All of the other 46 species sampled were negative. Virus isolations from the reproductive tract and urine of wild bats indicated that transmission to horses may have occurred via exposure to bat urine or birthing fluids.[12]

Australian outbreaks

As of 11 October 2011, a total of thirty-two events of Hendra virus have occurred, all involving infection of horses. As a result of these events, sixty-eight horses have died or been euthanised, with a further four having died or been euthanised as a result of possibly hendra infection.

Four of these outbreaks have spread to humans as a result of direct contact with infected horses. On 26 July 2011 a dog living on the Mt Alford property was reported to have HeV antibodies, the first time an animal other than a flying fox, horse, or human has tested positive outside an experimental situation.[13]

These events have all been on the east coast of Australia, with the most northern event at Cairns, Queensland and the event furthest south at Macksville, NSW. Until the event at Chinchilla, Queensland in July 2011, all outbreak sites had been within the distribution of at least two of the four mainland flying-foxes (fruit bats); Little red flying-fox, (Pteropus scapulatus), black flying-fox, (Pteropus alecto), grey-headed flying-fox, (Pteropus poliocephalus) and spectacled flying-fox, (Pteropus conspicillatus). Chinchilla is considered to be only within the range of little red flying-fox and is west of the Great Dividing Range. This is the furthest west the infection has ever been identified in horses.

The timing of incidents indicates a seasonal pattern of outbreaks, possibly related to the breeding cycle of the little red flying-foxes. These species typically give birth between April and May.[14][15] As there is no evidence of transmission to humans directly from bats, it is thought that human infection only occurs via an intermediate host, a horse.

  • August 1994, Mackay, Queensland: Death of two horses and one person, Mark Preston.[10]
  • September 1994, Hendra, Queensland: 20 horses died or were euthanised. Two people infected, with one death, Victor Rail who was a nationally prominent trainer of racing horses.[8]
  • January 1999, Trinity Beach, Cairns, Queensland: Death of one horse.[16]
  • October 2004, Gordonvale, Cairns, Queensland: Death of one horse. A veterinarian involved in autopsy of the horse was infected with Hendra virus, and suffered a mild illness.[17]
  • December 2004, Townsville, Queensland: Death of one horse.[17]
  • June 2006, Peachester, Sunshine Coast, Queensland: Death of one horse.[17]
  • October 2006, Murwillumbah, New South Wales: Death of one horse.[18]
  • July 2007, Peachester, Sunshine Coast, Queensland: Infection of one horse (euthanised)
  • July 2007, Clifton Beach, Cairns, Queensland: Infection of one horse (euthanised).[19]
  • July 2008, Redlands, Brisbane, Queensland: Death of five horses; four died from the Henda virus, the remaining animal recovered but was euthanised because of a government policy that requires all animals with antibodies to be euthanised due to a potential threat to health. Two veterinary workers from the affected property were infected leading to the death of one, veterinary surgeon Ben Cuneen, on the 20th of August, 2008. The second veterinarian was hospitalized after pricking herself with a needle she had used to euthanize the horse that had recovered. A nurse exposed to the disease while assisting Cuneen in caring for the infected horses was also hospitalized.[20] The Biosecurity Queensland website indicates that 8 horses died during this event (http://www.dpi.qld.gov.au/4790_11112.htm, access 31 July 2011) however a review of the event indicates that five horses are confirmed to have died from HeV and three of the horses "are regarded as improbable cases of Hendra virus infection ...".[21]
  • July 2008, Proserpine, Queensland; Death of four horses.[22]
  • July 2009, Cawarral, Queensland: Death of four horses.[23] Queensland veterinary surgeon Alister Rodgers tested positive after treating the horses.[24] On September 1, 2009 after two weeks in a coma, he became the fourth person to die from exposure to the virus.[25]
  • September 2009, Bowen, Queensland. Death of two horses.[22]
  • May 2010, Tewantin, Queensland: Death of one horse.[26]
  • 20 June 2011 - 31 July 2011, Mt Alford, (near Boonah) Queensland: Death of three horses (all confirmed to have died of Hendra) and sero-conversion of a dog. The first horse death on this property occurred on 20 June 2011, although it was not until after the second death on 1 July 2011 that samples taken from the first animal were tested. The third horse was euthanised on 4 July 2011.[27][28][29] On 26 July 2011 a dog from this property was reported to have tested positive for HeV antibodies. Reports indicate that this Australian Kelpie, a family companion, will be euthanised in line with government policy. Biosecurity Queensland suggest the dog most likely was exposed to HeV though one of the sick horses.[30][31] Dusty was euthanised on 31 July 2011 following a second positive antibody test.[32]
  • 26 June 2011, Kerry, Queensland (the horse was moved after it became sick to another property at Beaudesert), Queensland: Death of one horse.[33]
  • 28 June 2011 Loganlea, Logan City, Queensland: death of one horse.[34][35]
  • 29 June 2011, Mcleans Ridges, Wollongbar, New South Wales: Death of one horse.[36][37] The second horse on the property tested positive to Hendra and was euthanised on 12 July 2011.[38]
  • 3 July 2011, Macksville, New South Wales: Death of one horse.[39][40]
  • 4 July 2011, Park Ridge, Logan City, Queensland: Death of one horse.[41]
  • 11 July 2011, Kuranda, west of Cairns, Queensland: Death of one horse.[42]
  • 13 July 2011, Hervey Bay, Queensland: Death of one horse.[43]
  • 14 July 2011, Lismore, New South Wales: Death of one horse.[44]
  • 15 July 2011, Boondall, Queensland: Death of one horse.[45]
  • 22 July 2011, Chinchilla, Queensland:Death of one horse.[46]
  • 24 July 2011, Mullumbimby, New South Wales: Death of one horse.[47]
  • 13 August 2011, Mullumbimby, New South Wales: Death of one horse. A horse was found dead after being unwell the day before. HeV infection was confirmed on 17 August 2011.[48]
  • 15 August 2011 Ballina, New South Wales: Death of one horse.[49]
  • 17 August 2011, South Ballina, New South Wales: Death of two horses. The 2 horses were found dead in a field. Both tested positive to HeV. The exact date of death is not known however HeV infection was confirmed on 17 August 2011.[48]
  • 23 August 2011, Currumbin Valley, Gold Coast, Queensland: Death of one horse.[50]
  • 28 August 2011, North of Ballina, New South Wales:Death of one horse.[51]
  • 11 October 2011, Beechmere, Caboolture Queensland. One horse euthanised after testing positive. A horse died one week previous on the property may have died of HeV.[52] On 15 October 2011 another horse on the property was euthanised following a positive HeV antibody test.[53]

Events of June – August 2011

In the years 1994–2010, fourteen events were recorded. Between 20 June 2011 and 28 August 2011, a further seventeen events were identified, during which twenty-one horses died.

It's not clear why there has been a sudden increase in the number of spillover events between June and August 2011. Typically HeV spillover events are more common between May and October. This time is sometimes called "Hendra Season". This is a time when there are large number of fruit bat of all species congregated in SE Queensland as this area contains valuable winter foraging habitat. The weather (warm and humid) is favourable to the survival of henipavirus in the environment.[54]

There have been suggestions that the flooding that affected SE Queensland and Northern NSW in December 2010 and January 2011 may be having an impact upon the health of the fruit bats. Urine sampling in flying-fox camps indicate that a larger proportion of flying-foxes than usual are shedding live virus. Biosecurity Queensland's ongoing surveillance usually shows 7% of the animals are shedding live virus. In June and July nearly 30% animals have been reported to be shedding live virus.[55] Present advice is that these events are not being driven by any mutation in HeV itself.[56]

Other suggestions include that an increase in testing has led to an increase in detection. As the actual mode of transmission between bats and horses has not been determined, it is not clear what, if any, factors can increase the chance of infection in horses.[57]

Following the confirmation of a dog with HeV antibodies, on 27 July 2011, the Queensland and NSW governments will boost research funding into the Hendra virus by $6 million to be spent by 2014/2015. This money will be used for research into ecological drivers of infection in the bats and the mechanism of virus transmission between bats and other species.[58][59] A further 6 million dollars was allocated by the federal government with the funds being split, half for human health investigations and half for animal health and biodiversity research.[60]

Vaccine

A subunit vaccine that will neutralise Hendra virus is in development and is expected to be available in 2013. It is composed of a soluble version of the G surface antigen on Hendra virus and has been successful in ferret models.[61] The trial vaccine may be available in 2012.[62][63]

The vaccine is intended to be used in horses as stopping the virus at this point should protect both horses and humans.

Pathology

Flying foxes experimentally infected with the Hendra virus develop a viraemia then excrete the virus in their urine, faeces and saliva for approximately one week. Although they excrete live virus during this time there is no other indication of an illness.[64] Symptoms of Hendra virus infection of humans may be respiratory, including hemorrhage and edema of the lungs, or encephalitic, resulting in meningitis. In horses, infection usually causes pulmonary oedema, congestion and / or neurological signs.[65]

Ephrin B2 has been identified as the main receptor for the heniparviruses.

Nipah virus

Emergence

Pteropus vampyrus (Large flying fox), one of the natural reservoirs of Nipah virus

Nipah virus was identified in April 1999, when it caused an outbreak of neurological and respiratory disease on pig farms in peninsular Malaysia, resulting in 257 human cases, including 105 human deaths and the culling of one million pigs.[10][66] In Singapore, 11 cases, including one death, occurred in abattoir workers exposed to pigs imported from the affected Malaysian farms. The Nipah virus has been classified by the Centers for Disease Control and Prevention as a Category C agent.[67] The name "Nipah" is taken after the place, Kampung Nipah in Negeri Sembilan, Malaysia, the source of the human case from which Nipah virus was first isolated.[68]

The outbreak was originally mistaken for Japanese encephalitis (JE), however, physicians in the area noted that persons who had been vaccinated against JE were not protected, and the number of cases among adults was unusual [69] Despite the fact that these observations were recorded in the first month of the outbreak, the Ministry of Health failed to react accordingly, and instead launched a nationwide campaign to educate people on the dangers of JE and its vector, Culex mosquitoes.

Symptoms of infection from the Malaysian outbreak were primarily encephalitic in humans and respiratory in pigs. Later outbreaks have caused respiratory illness in humans, increasing the likelihood of human-to-human transmission and indicating the existence of more dangerous strains of the virus.

Based on seroprevalence data and virus isolations, the primary reservoir for Nipah virus was identified as Pteropid fruit bats, including Pteropus vampyrus (Large Flying Fox), and Pteropus hypomelanus (Small Flying-fox), both of which occur in Malaysia.

The transmission of Nipah virus from flying foxes to pigs is thought to be due to an increasing overlap between bat habitats and piggeries in peninsular Malaysia. At the index farm, fruit orchards were in close proximity to the piggery, allowing the spillage of urine, faeces and partially eaten fruit onto the pigs.[70] Retrospective studies demonstrate that viral spillover into pigs may have been occurring in Malaysia since 1996 without detection.[10] During 1998, viral spread was aided by the transfer of infected pigs to other farms, where new outbreaks occurred.

Outbreaks

Locations of henipavirus outbreaks (red stars–Hendra virus; blue stars–Nipah virus) and distribution of henipavirus flying fox reservoirs (red shading–Hendra virus ; blue shading–Nipah virus)

Eight more outbreaks of Nipah virus have occurred since 1998, all within Bangladesh and neighbouring parts of India. The outbreak sites lie within the range of Pteropus species (Pteropus giganteus). As with Hendra virus, the timing of the outbreaks indicates a seasonal effect. Cases occurring in Bangladesh during the winters of 2001, 2003, and 2004, were determined to have been caused by the Nipah virus.[71] In February, 2011, a Nipah outbreak began at Hatibandha Upazila in the Lalmonirhat district of northern Bangladesh. To date (7 February 2011), there have been 24 cases and 17 deaths in this outbreak.[72]

  • 2001 January 31 – February 23, Siliguri, India: 66 cases with a 74% mortality rate.[73] 75% of patients were either hospital staff or had visited one of the other patients in hospital, indicating person-to-person transmission.
  • 2001 April – May, Meherpur district, Bangladesh: 13 cases with nine fatalities (69% mortality).[74]
  • 2003 January, Naogaon district, Bangladesh: 12 cases with eight fatalities (67% mortality).[74]
  • 2004 January – February, Manikganj and Rajbari provinces, Bangladesh: 42 cases with 14 fatalities (33% mortality).
  • 2004 19 February – 16 April, Faridpur district, Bangladesh: 36 cases with 27 fatalities (75% mortality). Epidemiological evidence strongly suggests that this outbreak involved person-to-person transmission of Nipah virus, which had not previously been confirmed.[75] 92% of cases involved close contact with at least one other person infected with Nipah virus. Two cases involved a single short exposure to an ill patient, including a rickshaw driver who transported a patient to hospital. In addition, at least six cases involved acute respiratory distress syndrome which has not been reported previously for Nipah virus illness in humans. This symptom is likely to have assisted human-to-human transmission through large droplet dispersal.
  • 2005 January, Tangail district, Bangladesh: 12 cases with 11 fatalities (92% mortality). The virus was probably contracted from drinking date palm juice contaminated by fruit bat droppings or saliva.[76]
  • 2007 February – May, Nadia District, India: up to 50 suspected cases with 3-5 fatalities. The outbreak site borders the Bangladesh district of Kushtia where eight cases of Nipah virus encephalitis with five fatalities occurred during March and April 2007. This was preceded by an outbreak in Thakurgaon during January and February affecting seven people with three deaths.[77] All three outbreaks showed evidence of person-to-person transmission.
  • 2008 February - March, Manikganj and Rajbari provinces, Bangladesh: Nine cases with eight fatalities.[78]
  • 2010 January, Bhanga subdistrict, Faridpur, Bangladesh: Eight cases with seven fatalities. During March, one physician of Faridpur Medical College Hospital caring for confirmed Nipah cases died [79]
  • 2011 February: An outbreak of Nipah Virus has occurred at Hatibandha, Lalmonirhat, Bangladesh. The deaths of 21 schoolchildren due to Nipah virus infection were recorded on 4 February 2011. IEDCR has confirmed the infection is due to this virus.[80] Local schools were closed for one week to prevent the spread of the virus. People were also requested to avoid consumption of uncooked fruits and fruit products. Such foods, contaminated with urine or saliva from infected fruit bats, were the most likely source of this outbreak.[81]

Nipah virus has been isolated from Lyle's flying fox (Pteropus lylei) in Cambodia[82] and viral RNA found in urine and saliva from P. lylei and Horsfield's roundleaf bat (Hipposideros larvatus) in Thailand.[83] Infective virus has also been isolated from environmental samples of bat urine and partially-eaten fruit in Malaysia.[84] Antibodies to henipaviruses have also been found in fruit bats in Madagascar (Pteropus rufus, Eidolon dupreanum)[85] and Ghana (Eidolon helvum)[86] indicating a wide geographic distribution of the viruses. No infection of humans or other species have been observed in Cambodia, Thailand or Africa thus far.

Pathology

In humans, the infection presents as fever, headache and drowsiness. Cough, abdominal pain, nausea, vomiting, weakness, problems with swallowing and blurred vision are relatively common. About a quarter of the patients have seizures and about 60% become comatose and might need mechanical ventilation. In patients with severe disease, their conscious state may deteriorate and they may develop severe hypertension, fast heart rate, and very high temperature.

Nipah virus is also known to cause relapse encephalitis. In the initial Malaysian outbreak, a patient presented with relapse encephalitis some 53 months after his initial infection. There is no definitive treatment for Nipah encephalitis, apart from supportive measures, such as mechanical ventilation and prevention of secondary infection. Ribavirin, an antiviral drug, was tested in the Malaysian outbreak, and the results were encouraging, though further studies are still needed.

In animals, especially in pigs, the virus causes a porcine respiratory and neurologic syndrome, locally known as "barking pig syndrome" or "one mile cough."

In popular culture

Nipah virus was the inspiration for the MEV-1 virus in the film Contagion.[87]

Causes of emergence

The emergence of henipaviruses parallels the emergence of other zoonotic viruses in recent decades. SARS coronavirus, Australian bat lyssavirus, Menangle virus and probably Ebola virus and Marburg virus are also harbored by bats and are capable of infecting a variety of other species. The emergence of each of these viruses has been linked to an increase in contact between bats and humans, sometimes involving an intermediate domestic animal host. The increased contact is driven both by human encroachment into the bats’ territory (in the case of Nipah, specifically pigpens in said territory) and by movement of bats towards human populations due to changes in food distribution and loss of habitat.

There is evidence that habitat loss for flying-foxes, both in South Asia and Australia (particularly along the east coast) as well as encroachment of human dwellings and agriculture into the remaining habitats, is creating greater overlap of human and flying fox distributions.

See also

References

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