CD40LG and infection: Thus, considering that all symptomatic infections (NUCL) were confirmed by parasitological diagnostics (104), the prevalence rate of symptomatic infection was 18%, while among asymptomatic individuals examined (472), 320 were at least exposed according to results from the immunological tests (ELISA-IgM/IgG and DTH), generating an asymptomatic prevalence of 55.5%.