However, children in the upper 50th percentile of fecal IgA measured at 12 months and directed against either Cp23 or Cp17 were more likely to be subsequently cryptosporidiosis-free through age 3 years of life than children in the lower 50th percentile (Figure 1B and D; P = 0.0034 and 0.031 for Cp23 and Cp17, respectively). The gene discussed is CD79A; the disease is cryptosporidiosis.