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Am. J. Trop. Med. Hyg., 62(1), 2000, pp. 57-64
Copyright © 2000 by The American Society of Tropical Medicine and Hygiene

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American Journal of Tropical Medicine and Hygiene, Vol 62, Issue 1, 57-64
Copyright © 2000 by American Society of Tropical Medicine and Hygiene

Research Articles


Susceptibility and resistance to Schistosoma mansoni reinfection: parallel cellular and isotypic immunologic assessment

IR Caldas, R Correa-Oliveira, E Colosimo, OS Carvalho, CL Massara, DG Colley, and G Gazzinelli

Cellular and humoral immune responses to Schistosoma mansoni antigen preparations were evaluated in individuals presumed to be susceptible or resistant to reinfection after chemotherapeutic cure. A consistent proliferative increase in the response to soluble egg antigen (SEA) was observed post-treatment in both the susceptible and resistant groups. However, this change was not related to resistance. Isotype studies showed that IgM antibody levels to soluble worm antigen preparation (SWAP) and cercariae antigens were significantly higher in the resistant group than in the susceptible group. Post-treatment, an increase in IgE anti-SWAP and anti-schistosomular tegument (STEG) responses and a decrease in IgG4 anti-SEA and anti-STEG responses were observed in the resistant group. These finding are similar to those we have reported previously for a putative resistant group termed endemic normals, and are compatible with immunologic studies in different endemic areas. Together, these findings indicate that even on the population level, high IgE specificities coupled with low IgG4 specificities correlate well with documented resistance to reinfection.


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