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Quantitative studies on the transmission of Parahistomonas wenrichi by ova of Heterakis gallinarum

Published online by Cambridge University Press:  06 April 2009

Paul E. M. Fine
Paul E. M. Fine
Affiliation:
Department of Medical Protozoology, London School of Hygiene and Tropical Medicine, London WC1E 7HT
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Extract

Three groups of chickens were fed small numbers of ova (3, 5 or 9 ova per bird) of Heterakis gallinarum in a quantitative study of the transovarial transmission of Parahistomonas wenrichi by the nematode. Subsequent incidence rates of Parahistomonas infections in recipient birds were analysed according to the methods of Chiang & Reeves (1962). The results indicated that at least 25 % of Heterakis ova, passed in the faeces of birds with concomitant Parahistomonas infection, carried the protozoon. The appearance of Parahistomonas in a bird which retained all its challenge nematodes indicated that the protozoon can be released by living worms. Data on the pre-patent periods of Parahistomonas infections are consistent with a hypothesis that the protozoon is typically released at the time of the final (fourth) moult of the nematode.

Type
Research Article
Information
Parasitology , Volume 70 , Issue 3 , June 1975 , pp. 407 - 417
Copyright
Copyright © Cambridge University Press 1975

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References

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