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The nature of resistance of immune puppies to superinfection with Toxocara canis: evidence that immunity affects second- but not fourth-stage larvae

Published online by Cambridge University Press:  06 April 2009

S. T. Fernando ,
B. Vasudevan ,
T. Jegatheeswaran  and
T. Sooriyamoorthi
S. T. Fernando
Affiliation:
Department of Veterinary Science, University of Ceylon, Peradeniya Campus, Peradeniya, Ceylon
B. Vasudevan
Affiliation:
Department of Veterinary Science, University of Ceylon, Peradeniya Campus, Peradeniya, Ceylon
T. Jegatheeswaran
Affiliation:
Department of Veterinary Science, University of Ceylon, Peradeniya Campus, Peradeniya, Ceylon
T. Sooriyamoorthi
Affiliation:
Department of Veterinary Science, University of Ceylon, Peradeniya Campus, Peradeniya, Ceylon
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Extract

Fourth-stage larvae of Toxocara canis were introduced directly into the intestine of previously immunized puppies after laparotomy. They developed normally to the adult stage. In general 46–60% of the introduced larvae completed their development. By contrast the second-stage larvae introduced into similarly immunized puppies did not develop any further. No fourth-stage larvae or adult stages were noted in the nonimmunized controls. The post-immunization sera of puppies formed precipitates at the oral orifices of the second-stage but not of the fourth-stage larvae and antibody response was detected following infection with large doses of infective ova but not small doses of infective ova or fourth-stage larvae.

Type
Research Article
Information
Parasitology , Volume 66 , Issue 3 , June 1973 , pp. 415 - 422
Copyright
Copyright © Cambridge University Press 1973

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References

REFERENCES

Fernando, S. T., (1968 a). Immunological response of rabbits to Toxocara canis infection. Parasitology 58, 91–103.CrossRefGoogle ScholarPubMed
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