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Schistosoma mansoni: importance of skin and pulmonary phases to concomitant immunity in albino mice

Fourteen-day-old schistosomula obtained from mice previously infected were surgically transferred to the portal vein of receptor mice. Another group of mice was infected with cercariae by transcutaneous route. After 90 days, those groups were challenged with 100 cercariae, transcutaneously, as well...

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Bibliographic Details
Published in:Revista do Instituto de Medicina Tropical de São Paulo 1985-04, Vol.27 (2), p.86-88
Main Authors: ROCHA, M. O, COELHO, P. M. Z, MELLO, R. T
Format: Article
Language:English
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Summary:Fourteen-day-old schistosomula obtained from mice previously infected were surgically transferred to the portal vein of receptor mice. Another group of mice was infected with cercariae by transcutaneous route. After 90 days, those groups were challenged with 100 cercariae, transcutaneously, as well as a control group. Two weeks later the animals were perfused and mature and immature worms counted separately. Statistically significant differences were observed in the recovery of immature worms, when the control group was compared with those twice infected. No statistical difference was detected between the group infected transcutaneously, and that infected by worm inoculation in portal vein. Results demonstrated that suppression of skin and lung migration of the parasite does not interfere with the development of the so called concomitant immunity. Esquistossômulos com 14 dias de idade, obtidos de camundongos previamente infectados, foram cirurgicamente transferidos para a veia porta de camundongos receptores. Outro grupo de camundongos foi infectado com cercárias por via transcutânea. Noventa dias após, aqueles grupos foram desafiados com 100 cercárias, transcutaneamente, assim como o grupo controle. Duas semanas mais tarde, os animais foram perfundidos e os vermes — maduros e imaturos — contados separadamente. Diferenças estatisticamente significativas foram observadas na recuperação dos vermes imaturos, quando o grupo controle foi comparado com aqueles grupos infectados duas vezes. Nenhuma diferença estatística foi detectada entre o grupo infectado transcutaneamente e o grupo infectado por inoculação do verme na veia porta. Os resultados demonstraram que a supressão da migração do parasito através da pele e dos pulmões não interfere no desenvolvimento da chamada imunidade concomitante.
ISSN:0036-4665
1678-9946
1678-9946
0036-4665
DOI:10.1590/S0036-46651985000200005