FIG. 2.

Immunoblot analysis of human antibody (IgG) response to S. mansoni antigens extracted with n-butanol from the adult worm membrane fraction. (a) Immunoblot profile of BE with sera (n = 40) from Caraballeda (a site without transmission since 20 years ago but still having infected patients); (b) antigen recognition frequency. Molecular mass markers (in kilodaltons) are shown on the left. C(+), S. mansoni-positive sera; C(-), controls. The results shown are representative of three independent replicated experiments.