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The epidemiology of Schistosoma spindale Montgomery, 1906 in cattle in Sri Lanka

Published online by Cambridge University Press:  06 April 2009

J. De Bont ,
J. Vercruysse ,
D. Van Aken ,
V. R. Southgate ,
D. Rollinson  and
C. Moncrieff
J. De Bont
Affiliation:
Department of Parasitology, Faculty of Veterinary Medicine, State University of Gent, Casinoplein 24, 9000 Gent, Belgium
J. Vercruysse
Affiliation:
Department of Parasitology, Faculty of Veterinary Medicine, State University of Gent, Casinoplein 24, 9000 Gent, Belgium
D. Van Aken
Affiliation:
Department of Parasitology, Faculty of Veterinary Medicine, State University of Gent, Casinoplein 24, 9000 Gent, Belgium
V. R. Southgate
Affiliation:
Department of Zoology, The Natural History Museum, Cromwell Road, South Kensington, London SW7 5BD, UK
D. Rollinson
Affiliation:
Department of Zoology, The Natural History Museum, Cromwell Road, South Kensington, London SW7 5BD, UK
C. Moncrieff
Affiliation:
Department of Zoology, The Natural History Museum, Cromwell Road, South Kensington, London SW7 5BD, UK
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Summary

During 1988 and 1989, the mesenteric veins of 901 cattle were examined for the presence of schistosomes at the Kandy slaughterhouse (Sri Lanka). The overall prevalence of infection was 31·2%. Animals younger than 2 years were less infected (21·3%) than those older than 5 years (47·9%). Based on the number of paired worms counted, three intensities of infection were recognized: low (1–20 pairs), moderate (21–100 pairs) and heavy (> 100 pairs). Intensities increased with the age of the animals but remained low (average 10 worm pairs). The worm burden increased by approximately 20% for each step in age group. The number of miracidia/100 g faeces was measured in 85 animals of all age groups and intensities of infection; 77% of the samples contained less than 100 miracidia. Miracidia counts decreased with age; moderately and heavily infected animals in each age group had the highest and the lowest counts, respectively. This may be due to a host immune response. The results raise questions on the sensitivity of faecal egg counts as a diagnostic method for visceral schistosomiasis in cattle.

Keywords

Schistosoma spindaleepidemiologyresistancecattle
Type
Research Article
Information
Parasitology , Volume 102 , Issue 2 , April 1991 , pp. 237 - 241
Copyright
Copyright © Cambridge University Press 1991

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