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ELISA endpoint titers. (A) Env-specific and (B) Gag-specific IgG titers in serum obtained from 32 SIV-naive and SIV-infected rhesus macaques. (C) Env-specific and (D) Gag-specific IgA titers in eluates from rectal swabs obtained from 35 SIV-naive and SIV-infected rhesus macaques. Dotted lines indicate positive cutoff values. ELISA, enzyme-linked immunosorbent assay; SIV, simian immunodeficiency virus.
