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Samples found to be negative for SIV-specific antibody (Ab) titers by ELISA exhibit detectable titers using the Bio-Plex assay. Fold change in endpoint titer compared with positive cutoff value for each ELISA-negative sample is shown. (A) Env-specific and (B) Gag-specific serum IgG assays. (C) Env-specific and (D) Gag-specific rectal swab eluate IgA assays.
