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The global distribution of HIV-1 genotypes.

HIV-1 virus prevalent in major centers of the pandemic is subdivided into genetic subtypes called clades. Clades A-F are most commonly seen with each sequence subtype being practically equidistant from the others. The distance separating the subtypes encompasses about 30% of the env gene and 14% of the gag gene. The gag and env HIV structural genes together comprise approximately 40% of the viral genome. As HIV-1 sequences are determined and analyzed they can usually be assigned to one of the six A-F clades. Viral forms intermediate between clades have not yet been found although rare sequences falling outside of the six clusters are being discovered and tentatively designated as clades G H and I. O (outlying) group HIV-1 forms appear to be minor contributors to the epidemic but suggest a second independent HIV-1 evolutionary radiation event. It remains unclear whether some clades are more virulent than others. HIV-1 subtype B is the isolate most commonly identified in North America South America and Europe although subtypes C and F are also found in South America in smaller numbers as are subtypes A C D and F in Europe. Subtypes B C and E are seen in Asia with clades C and E appearing to predominate. Subtypes A C and D are most frequently found in Africa although all other clades including group O forms have also been recorded on the continent.