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High levels of congenital transmission of toxoplasma gondii in a commercial sheep flock

Duncanson, P, Terry, RS, Smith, JE and Hide, G 2001, 'High levels of congenital transmission of toxoplasma gondii in a commercial sheep flock' , International Journal for Parasitology, 31 (14) , pp. 1699-1703.

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Abstract

Our current understanding of congenital transmission of Toxoplasma gondii from ewe to lamb dictates that infection frequently results in abortion and the death of the developing foetus, that the birth of live infected lambs occurs rarely and that the cat is the predominant source of infection in ewes. Using direct polymerase chain reaction detection of T. gondii, we report high levels of congenital transmission occurring in a commercially managed sheep flock. We sampled foetal-derived placental tissue and tissues from aborted lambs and showed that congenital transmission was detected in these tissues from 61% of all pregnancies. Where pregnancies resulted in the death of one or more lambs, T. gondii was detected in the lamb tissue for all but one of 18 (94%) pregnancies. Of the successful pregnancies resulting in the birth of live lambs we were able to detect T. gondii in foetal-derived placental tissue from 37 of 70 (42%) pregnancies. These results show that congenital transmission is occurring in a high percentage of lambings including normal healthy lambings, at this farm, suggesting that this route of transmission from generation to generation may be much more significant than that reported previously. These results may have implications for sheep husbandry and future epidemiological studies of T. gondii.

Item Type: Article
Uncontrolled Keywords: Toxoplasma gondii, congenital transmission, polymerase chain reaction, ovine abortion, placenta
Themes: Subjects / Themes > Q Science > Q Science (General)
Subjects / Themes > S Agriculture > SF Animal culture
Subjects outside of the University Themes
Schools: Colleges and Schools > College of Science & Technology
Colleges and Schools > College of Science & Technology > School of Environment and Life Sciences
Colleges and Schools > College of Science & Technology > School of Environment and Life Sciences > Ecosystems and Environment Research Centre
Journal or Publication Title: International Journal for Parasitology
Publisher: Elsevier
Refereed: Yes
ISSN: 00207519
Depositing User: H Kenna
Date Deposited: 07 Aug 2007 16:21
Last Modified: 20 Aug 2013 16:45
URI: http://usir.salford.ac.uk/id/eprint/153

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