FIG. 6.

Representative profiles showing longitudinal IgG responses to the 27-kDa antigen and CpP2 in three Peruvian children (A to C, respectively). Longitudinal serum samples collected from the children were assayed for IgG antibodies by using the recombinant 27-kDa protein and CpP2, as described in Materials and Methods. Responses are presented in arbitrary units on the basis of a standard curve with a maximum value of 6,400. Asterisks, intervals that had serologic antibody responses to both the 17- and 27-kDa antigens, according to our response definition; closed stars, intervals during which a CpP2 antibody response occurred in conjunction with a 17- and 27-kDa antibody response; open stars, CpP2 responses during intervals that did not meet our Cryptosporidium-specific antibody response definition for the 17- and 27-kDa antigens. Cryptosporidium oocyst detection events are shown by black arrows.