Serosorting is the practice of seeking to only engage in
sexual activitieswith partners who are of the same HIV statusas ones self. This practice has been reported becoming common among gaymen in some communities, as a measure to reduce the risk of acquiring HIVinfection.
Serosorting is not free of risk. Firstly, some people may not be sure of their true HIV status, or lie about it. Even a recent negative HIV test may not be definitive, if they are still within the
window periodafter a recent infection. Secondly, just because someone does not have HIV does not mean that they are free of other sexually transmitted diseases such as syphilisor hepatitis B.
unprotected sexbetween two HIV+ people is not free of risk. Infection with one strain of HIV does not preclude later infection with another. There is a great deal of genetic variability within individual HIV virus populations and this variability is shuffled and mutatedevery time the virus reproduces inside a cell in the body. There are millions of viruses in the body of an infected person. Modern drug cocktails keep virus and mutation levels low but eventually drug resistancewill develop. Unprotected sex between two HIV+ individuals does risk that one with a less aggressive, drug susceptible strain of the virus who might have kept his infection well under the control of the available drugs, might find him or herself with an aggressively drug resistant straincite journal
title=HIV drug resistance acquired through superinfection
author=Smith et al
pages=1251-1256] . Futhermore, dual infection has been associated with more rapid progression to AIDS [cite journal
title=Dual HIV-1 infection associated with rapid disease progression
author=Gottlieb, et al
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