Argentina 2 B/F recombinant viruses Base Sequence 2 DNA Primers 2 Female 2 HIV Infections 2 HIV-1 2 HIV-1 primary resistance 2 Human immunodeficiency virus 1 2 Human immunodeficiency virus infection 2 Humans 2 K103N 2 L89M 2 M41L 2 Male 2 Mutation 2 Phylogeny 2 Polymorphism, Genetic 2 RNA directed DNA polymerase 2 RNA directed DNA polymerase inhibitor 2 Recombination, Genetic 2 Reverse Transcriptase Inhibitors 2 Reverse Transcriptase Polymerase Chain Reaction 2 Western blotting 2 adult 2 amino acid sequence 2 amino acid substitution 2 controlled study 2 exposure 2 female 2