Fig 1.

Phylogenetic analysis of the gp120 region using a minimum evolution criterion and maximum likelihood distances assuming an HKY+Γ model of evolution. Nucleotide alignment was based on the protein alignment in Fig. 3. P.ENV and V.ENV are DNA sequences for provirus PCR products from the patient and victim, respectively. Sequence names beginning with LA denote viral sequences from control HIV-1 infected individuals from the Lafayette, LA, metropolitan area. The same pattern of relationships (monophyly of all patient and victim sequences) was obtained with all phylogenetic methods (parsimony, minimum evolution, and Bayesian) and all models of evolution examined. In addition to the 100% bootstrap support of this relationship for the minimum evolution analyses, the parsimony bootstrap support and the Bayesian posterior support were also 100%.