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. 2006 Jan;13(1):123–131. doi: 10.1128/CVI.13.1.123-131.2006

FIG. 2.

FIG. 2.

The magnitude of the antibody response is correlated with age. The first available sample collected from each child (n = 61, 71, 63, and 28) in each age group (<12 months, 12 to 23 months, 24 to 35 months, and 36 to 47 months, respectively) was analyzed for antibodies to the 27-kDa (A) and 17-kDa (B) antigens by ELISA as previously described. Boxes enclose the 25th to 75th percentiles, whiskers indicate the 10th to 90th percentiles, and closed circles indicate the 5th and 95th percentiles for each age group. The medians (indicated by bars) are 120, 162, 250, and 359 arbitrary units for the 27-kDa antigen assay and 35, 35, 63, and 116 arbitrary units for the 17-kDa antigen assay, respectively. The first available sample collected from each child in each age group was also used to calculate a prevalence rate (C). A child was considered to be positive at a given time point for antibodies to Cryptosporidium if the antibody levels to both the 27-kDa and 17-kDa antigens were above the cutoff values (>160 and >57 arbitrary units, respectively).