Schistosoma mansoni: protective immunity in mice cured by chemotherapy at the chronic phase of the disease
Rev. Inst. Med. Trop. Säo Paulo
;
35(4): 337-344, Jul.-Aug. 1993.
Article
in English
| LILACS
| ID: lil-320559
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 primo-infection, 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.
Full text:
Available
Index:
LILACS (Americas)
Main subject:
Schistosomiasis mansoni
Limits:
Animals
Language:
English
Journal:
Rev. Inst. Med. Trop. Säo Paulo
Journal subject:
Tropical Medicine
Year:
1993
Type:
Article
Affiliation country:
Brazil
Institution/Affiliation country:
Universidade Federal do Ceará/BR
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