CladeJAMA A group of related HIV variants, classified according to degree of genetic similarity. HIV variants are
currently grouped into clades A, B, C, D, E, F, and O.
a phylogenetically distinct strain of a microorganism.
There are at least 11 subtypes of HIV-1 classified into 2 groups: group
M (containing subtypes A through J) and group O. Subtype B is predominant
in the U.S. There are 5 known subtypes of HIV-2 (A-E). See also strain.
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