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Circulating anodic antigen (CAA) levels detectable in urine specimens collected at baseline, 1, 3, 8, and 9 weeks after infection from baboons infected with Schistosoma mansoni cercariae and perfused at week 9 to determine worm burdens. CAA levels, shown on the y axis on a logarithmic scale, were measured in urine with the UCAA250 assay and demonstrate detectable levels (above the UCAA cutoff threshold, gray area) by week 3.
