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Control templates were amplified with the same primer set from plasmid clones containing SHIV genes with or without both the K315R and N640D mutations to create standards.

Upstream OLA probes were designed to contain either the 315R or 640D mutation at the 3′ end and were 5′ radiolabeled with [γ-P]ATP using T4 polynucleotide kinase (Invitrogen).

This rhesus CCR5-specific/PSC- RANTES resistance selection is particularly alarming given the relative homogeneity of the SHIV In light of recent failures of promising human immunodeficiency virus type 1 (HIV-1) vaccine candidates, microbicides have regained prominence as a method to prevent HIV-1 transmission.

Unfortunately, vaginal microbicide trials with well-tolerated antimicrobial compounds such as carrageenan (Carraguard) were ineffective at blocking HIV-1 transmission (31, 36).

External PCR products derived from reverse-transcribed plasma RNA or cellular proviral DNA (for fitness competitions) was amplified by PCR using the primer set E110-E45A (1,342 bp) to encompass both amino acid changes to be analyzed.

For analysis of the mutational prevalence, samples were analyzed from virus extracted at three different time points from macaque m584, from the inoculating SHIV virus population, from a population of virus derived from two macaques treated with either 10 μM or 33 μM PSC-RANTES, and from three populations of virus derived from phosphate-buffered saline (PBS)-treated macaques.

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These trials provide a strong rationale for thorough screening of drug resistance in the current macaque models.Diversity in the transferred virus population may pose problems, as illustrated in prevention of mother-to-infant transmission.Although nevirapine is ∼80% effective in blocking perinatal HIV-1 transmission (33), at least 50% of infants harbor nevirapine-resistant virus within 48 h of delivery and nevirapine treatment (3, 35). RH-CCR5 (obtained from the NIH AIDS Research and Reference Reagent Program from Preston Marx) into the presence of PSC-RANTES were obtained as described previously (21).

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Viral RNA was extracted from the plasma using a viral RNA minikit (Qiagen) and then reverse transcribed using Moloney murine leukemia virus reverse transcriptase (Invitrogen, Carlsbad, CA) and the primer SHIV ext anti (for primer sequences, see Table S1 in the supplemental material). DNA sequencing was performed by Davis Sequencing Services using the primers SIS2 and SHIV int anti.

Given the relative homogeneity of the inoculating SHIV in macaque studies versus inoculating HIV-1 in human transmissions, current macaque microbicide models may underestimate the possible selection of drug-resistant HIV-1 from the inoculating SHIV. Hu-R5) were obtained through the NIH AIDS Research and Reference Reagent Program, Division of AIDS, NIAID, NIH (8). Hu-R5 cells, and titers were determined on both U87. CD4 cells (obtained from the NIH AIDS Research and Reference Reagent Program from Hongkui Deng and Dan R.