FIG. 3.

Distribution and geometric mean values of IgG antibody titers to crude antigen determined by ELISA (a) and NIE determined by luciferase immunoprecipitation system assay (LIPS) (b) for 228 study samples from Argentina classified according to serologic results and the presence or absence of hookworms in the stool analyses. The serologic cutoff is marked as a thin horizontal line. Geometric means per group are shown as thick horizontal lines. P values were calculated using the Mann-Whitney U test (two tailed).