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The induction of specific immunity against Schistosoma japonicum by exposure of mice to ultraviolet attenuated cercariae

Published online by Cambridge University Press:  06 April 2009

N. A. Moloney
Affiliation:
London School of Hygiene and Tropical Medicine, Winches Farm Field Station, 395 Hatfield Road, St Albans, Herts. AL4 0XQ
Q. D. Bickle
Affiliation:
London School of Hygiene and Tropical Medicine, Winches Farm Field Station, 395 Hatfield Road, St Albans, Herts. AL4 0XQ
G. Webbe
Affiliation:
London School of Hygiene and Tropical Medicine, Winches Farm Field Station, 395 Hatfield Road, St Albans, Herts. AL4 0XQ

Extract

Mice can be partially protected against Schistosoma japonicum by prior exposure to ultraviolet (UV)-attenuated infections which fail to survive to the adult stage and produce no overt pathology in the host. Optimum resistance was induced by parasites exposed to 40 seconds of UV, significantly lower levels of resistance being stimulated by both shorter and longer exposures. No consistent relationship between the degree of resistance induced and the number of irradiated cercariae given could be demonstrated and equivocal results were obtained when comparing the efficacy of single and multiple vaccinations. Vaccinations with UV-attenuated cercariae given intraperitoneally (i.p.) were as efficacious as those given percutaneously but mice were as or more resistant to challenges given by the i.p. route, the possible reasons are discussed. There was no observed delay in the migration of the challenge, vaccinated mice being as resistant when perfused 6 or 3·5 weeks after challenge. Vaccination was species specific since mice exposed to either UV-attenuated S. japonicum cercariae or gamma-attenuated S. mansoni cercariae were resistant to homologous but not heterologous challenge.

Type
Research Article
Copyright
Copyright © Cambridge University Press 1985

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References

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