Therefore, the prevalence of infection was first estimated considering the symptomatic cases (NUCL) confirmed by the parasitological exam (n = 104), which generated a prevalence rate of 18%, and, in the second, considering the cases of asymptomatic infection confirmed by immunological tests (ELISA-IgM/IgG and DTH), which revealed an asymptomatic prevalence rate of 55.5%. Here, CD40LG is linked to infection.