John D. Altman is in the Department of Microbiology and Immunology, and Mark B. Feinberg is in the Department of Medicine and the Department of Microbiology and Immunology, Emory University School of Medicine; both authors are also at the Emory Vaccine Center, Atlanta, Georgia 30329, USA. mbf@sph.emory.edu
HIV mutates to avoid the pressure of the immune system. This process is balanced by the need of the virus to replicate efficiently. Two studies examine this dynamic as the virus infects new hosts (pages 275−281 and 282−289).
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