PMC

A representative phylogenetic neighbor-joining tree for HIV-1 non-subtype B pol protease-reverse transcriptase sequences. HIV-1 subtypes are shown in pink, CRFs are shown in blue, and reference strains are shown in gray. Subtype and CRF designations for reference strains from the Los Alamos HIV Sequence Database are shown near each branch. Bootstrap values at key nodes are indicated.

Geographic distribution of HIV-1 non-B subtype specimens. Samples were received from 46 states; non-B viruses were detected in 37 states. Non-B and recombinant forms identified in each state are listed. Colors indicate the total number of samples received and the number of non-subtype B strains identified per state. The subtype/CRF designations normally shown after the underscore in the formal CRF nomenclature have been deleted to enhance legibility. (Modified from a map by Theshibboleth from Wikimedia Commons under the terms of the GNU Free Documentation License.)