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Plasma viral loads in macaques challenged with SHIV-1157ipEL-p. Plasma viral RNA (log vRNA copies/ml). (a) Group 1 (33C6-IgM); (b) Group 2 (33C6-IgG1); (c) Group 3 (controls). Black dotted line, limit of viral RNA detection (50 copies/ml). (d) Kaplan-Meier analysis of time until peak viremia. Log-rank test was used to determine significance.
