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Am. J. Trop. Med. Hyg., 62(6), 2000, pp. 740-745
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 6, 740-745
Copyright © 2000 by American Society of Tropical Medicine and Hygiene

Research Articles


Human immune response to sand fly salivary gland antigens: a useful epidemiological marker?

A Barral, E Honda, A Caldas, J Costa, V Vinhas, ED Rowton, JG Valenzuela, R Charlab, M Barral-Netto, and JM Ribeiro

Antibody (IgG) responses to salivary gland homogenate and to a recombinant salivary protein from the sand fly Lutzomyia longipalpis were investigated using sera from children living in an endemic area of visceral leishmaniasis in Brazil. We classified children into four groups according to their responses to Leishmania antigen: (Group I) positive serology and positive delayed type hypersensitivity (DTH), (Group II) positive serology and negative DTH, (Group III) negative serology and positive DTH, and (Group IV) negative serology and negative DTH. A highly significant correlation was found between anti-salivary gland IgG levels and DTH responses. An L. longipalpis salivary recombinant protein used as an antigen in an enzyme-linked immuno sorbent assay (ELISA) gave a significant but different result. A positive correlation was found between anti-Leishmania IgG and anti-recombinant protein IgG titers. The results indicate that sand fly salivary proteins may be of relevance to the study the epidemiology of leishmaniasis.


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