Neospora abortions in dairy cattle: Diagnosis, mode of transmission and control

Hall, CA; Reichel, MP; Ellis, JT

Neospora abortions in dairy cattle: Diagnosis, mode of transmission and control

Hall, CA Reichel, MP

Ellis, JT

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Publication Type:: Journal Article
Citation:: Veterinary Parasitology, 2005, 128 (3-4), pp. 231 - 241
Issue Date:: 2005-03-31

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Field	Value	Language
dc.contributor.author	Hall, CA	en_US
dc.contributor.author	Reichel, MP https://orcid.org/0000-0002-9792-8336	en_US
dc.contributor.author	Ellis, JT https://orcid.org/0000-0001-7328-4831	en_US
dc.date.available	2004-12-13	en_US
dc.date.issued	2005-03-31	en_US
dc.identifier.citation	Veterinary Parasitology, 2005, 128 (3-4), pp. 231 - 241	en_US
dc.identifier.issn	0304-4017	en_US
dc.identifier.uri	http://hdl.handle.net/10453/3909
dc.description.abstract	Aim: To determine the contribution of Neospora caninum to abortions on a dairy farm in NSW (Australia), determine the mode of transmission and develop and trial a control option for infection. Methods: Two whole herd bleeds were conducted 12 months apart and the association between serological status and abortion events were calculated for a number of bovine abortifacients. Family trees were constructed for N. caninum seropositive cattle in the herd. Some N. caninum seropositive cows were culled from the herd and no female offspring was retained from seropositive cows. Results: At the first whole-herd bleed in December 2002 a seroprevalence of 10.2% for N. caninum infection was detected. Cows with N. caninum infection were 13 times more likely to abort than uninfected ones. Seventy-five percent of seropositive animals in the herd were related, suggesting a high degree of congenital infection/transmission. Only 15% of infections were likely to be postnatally acquired. Selective culling of seropositive cows and not breeding from them reduced the number of seropositive animals. Only one newly sero-converted cow was detected at the second whole-herd bleed 12 months later. Conclusions: Seroepidemiological approaches were able to establish a high degree of association between N. caninum infection and low-level abortion in the dairy herd. Vertical transmission of infection was the predominant mode of infection and hence control efforts aimed at selectively culling seropositive animals from the herd were highly successful in reducing the level of infection. © 2005 Elsevier B.V. All rights reserved.	en_US
dc.relation.ispartof	Veterinary Parasitology	en_US
dc.relation.isbasedon	10.1016/j.vetpar.2004.12.012	en_US
dc.subject.classification	Mycology & Parasitology	en_US
dc.subject.mesh	Animals	en_US
dc.subject.mesh	Cattle	en_US
dc.subject.mesh	Dogs	en_US
dc.subject.mesh	Neospora	en_US
dc.subject.mesh	Coccidiosis	en_US
dc.subject.mesh	Abortion, Veterinary	en_US
dc.subject.mesh	Cattle Diseases	en_US
dc.subject.mesh	Dog Diseases	en_US
dc.subject.mesh	Antibodies, Protozoan	en_US
dc.subject.mesh	Enzyme-Linked Immunosorbent Assay	en_US
dc.subject.mesh	Seroepidemiologic Studies	en_US
dc.subject.mesh	Pedigree	en_US
dc.subject.mesh	Carrier State	en_US
dc.subject.mesh	Pregnancy	en_US
dc.subject.mesh	New South Wales	en_US
dc.subject.mesh	Female	en_US
dc.subject.mesh	Infectious Disease Transmission, Vertical	en_US
dc.subject.mesh	Disease Transmission, Infectious	en_US
dc.title	Neospora abortions in dairy cattle: Diagnosis, mode of transmission and control	en_US
dc.type	Journal Article
utslib.citation.volume	3-4	en_US
utslib.citation.volume	128	en_US
utslib.for	070708 Veterinary Parasitology	en_US
utslib.for	0605 Microbiology	en_US
utslib.for	0704 Fisheries Sciences	en_US
utslib.for	0707 Veterinary Sciences	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Life Sciences
utslib.copyright.status	closed_access
pubs.issue	3-4	en_US
pubs.publication-status	Published	en_US
pubs.volume	128	en_US

Abstract:

Aim: To determine the contribution of Neospora caninum to abortions on a dairy farm in NSW (Australia), determine the mode of transmission and develop and trial a control option for infection. Methods: Two whole herd bleeds were conducted 12 months apart and the association between serological status and abortion events were calculated for a number of bovine abortifacients. Family trees were constructed for N. caninum seropositive cattle in the herd. Some N. caninum seropositive cows were culled from the herd and no female offspring was retained from seropositive cows. Results: At the first whole-herd bleed in December 2002 a seroprevalence of 10.2% for N. caninum infection was detected. Cows with N. caninum infection were 13 times more likely to abort than uninfected ones. Seventy-five percent of seropositive animals in the herd were related, suggesting a high degree of congenital infection/transmission. Only 15% of infections were likely to be postnatally acquired. Selective culling of seropositive cows and not breeding from them reduced the number of seropositive animals. Only one newly sero-converted cow was detected at the second whole-herd bleed 12 months later. Conclusions: Seroepidemiological approaches were able to establish a high degree of association between N. caninum infection and low-level abortion in the dairy herd. Vertical transmission of infection was the predominant mode of infection and hence control efforts aimed at selectively culling seropositive animals from the herd were highly successful in reducing the level of infection. © 2005 Elsevier B.V. All rights reserved.

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http://hdl.handle.net/10453/3909