Schistosoma mansoni: protective immunity in mice cured by chemotherapy at the chronic phase of the disease

Author:

Bezerra Fernando Schemelzer de Moraes1,Coelho Paulo Marcos Zech2,Tavares Carlos Alberto Pereira2

Affiliation:

1. Universidade Federal do Ceará, Brasil

2. Universidade Federal de Minas Gerais, Brasil

Abstract

Aiming at demonstrating a decrease of acquired immunity after chemotherapeutic cure, a group of mice was infected with 25 Schistosoma mansoni cercariae (LE strain). A part of these animals was treated with 400 mg/kg oxamniquine, at 120 days after infection. Challenge infections were carried out at 45, 90 and 170-day-intervals after treatment (185, 210 and 290 days after primoinfection, respectively). Recovery of worms at 20 days after reinfections showed that a residual immunity remains up to 90 days after treatment, and disappears at 170 days after cure. Using the ELISA method, it was possible to detect a decrease of antibody levels (total IgG) in the treated group, when antigens from different evolutive stages of S. mansoni were used. The epidemiological implications of the present results, and the possible mechanisms involved in the decrease of acquired immunity after treatment are discussed.

Publisher

FapUNIFESP (SciELO)

Subject

Infectious Diseases,General Medicine

Reference46 articles.

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2. The changing pattern of pathology due to S. mansoni infection;ANDRADE Z.;Mem. Inst. Oswaldo Cruz,1985

3. Tópicos em Gastroenterologia-2;ANDRADE Z.,1991

4. Immune inflammatory response to parasite: the role of basophils, mast cells and vasoactive ammines;ASKENASE P.W.;Amer. J. trop. Med. Hyg.,1977

5. Quantitative aspects of the asynchronism in the development of S. mansoni in mice;BARBOSA M.A.;Rev. Inst. Med. trop. S. Paulo.,1978

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