PMC

(A) Flowchart of the strategy used for cloning and screening R5-SHIVs. Restriction sites used to introduce the Env PCR products and ligate the two genome halves are noted.
(B) Replication of SHIVs encoding the indicated Env proteins in MT2 cells engineered to express CCR5. Infectious virus in supernatant samples collected from MT2-R5 cells at the indicated times p.i. was measured using TZM-bl cells. Results from a representative experiment (of two performed) are shown. See also and .

(A) Plasma viremia, CD4⁺ T cell counts in blood, and CD4⁺ T cell frequency in the GALT for 2 macaques (one in red and one in black) inoculated intravenously with 2.9 × 10⁵ i.u. of SHIV_AD081. Asterisks in bar graphs indicate unavailable samples.
(B) As in (A), except that two macaques were inoculated intravenously with 4.8 × 10⁵ i.u. of SHIV₁₀₅₄.
(C) Plasma viremia for six macaques inoculated intrarectally with varying doses of SHIV₁₀₅₄. Arrows indicate time and colors the dose of viral challenge; white arrow is 3 × 10³ i.u., blue arrow is 3 × 10⁴ i.u., black arrow is 7.4 × 10⁴ i.u., and red arrow is 2.1x10⁵ i.u. See also .

(A) PGT121 antibody concentration in serum of animals infused with the antibody on day −1. Day 0 is the day of challenge with SHIV₁₀₅₄. Dotted line indicates antibody concentration that achieves 90% neutralization of SHIV₁₀₅₄ in vitro.
(B) Plasma viremia in macaques receiving pre-exposure transfusion of PGT121 or control monoclonal antibodies at 10 mg/kg, followed by an intrarectal SHIV₁₀₅₄ challenge using 2.1 × 10⁵ i.u. of virus. Animals in both groups are shown in #1 blue, #2 green, #3 purple, #4 red, #5 black, and #6 orange. See also and .

(A and B) Plasma viral load in macaques inoculated with cocktails of SHIVs from Group 1 (A) or Group 2 (B). Animals were depleted of CD8⁺ cells at the time of and 1 week post inoculation. Red x indicates euthanasia due to AIDS. (C and D) Phylogenetic analysis of Env sequences found in the plasma of Group 1 (C) or Group 2 (D) SHIV-infected macaques. Black lines represent unmodified Env sequences from Group 1 or Group 2 viruses inoculated into animals and colored lines Env sequences obtained from infected animals at the indicated times p.i. Predominant Env sequences are labeled. See also .