| Application of the Neospora caninum IgG avidity ELISA in assessment of chronic reproductive losses after an outbreak of neosporosis in a herd of beef cattle. | |
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MedLine Citation:
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PMID: 12580287 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Point-source infections are most likely the cause for Neospora caninum-induced abortion outbreaks in cattle, whereas an increased annual abortion rate may be a consequence of vertical transmission. The aims of the present study were to examine the reproductive effects of neosporosis in a beef herd for 3 years, after a point-source outbreak and to use IgG avidity serology to examine the chronicity of infections and patterns of transmission. During the study, 76-78% of animals were seropositive for N. caninum. The pregnancy rate varied from 88% to 94%, without any reduction in the pregnancy rate of seropositive cows compared with seronegative cows. The annual abortion rate was 2.5-5.5%, and all but 1 abortion occurred in seropositive dams. The efficiency of vertical transmission was estimated to be 85%. Several calves, born to seronegative dams, were seropositive at 6-13 months of age, indicating a 22% mean annual rate of horizontal transmission. The mean avidity in seropositive cows increased from 30 during the initial outbreak to 74 after 3 years. The mode of IgG avidity was 21-40 during the initial abortion outbreak, 41-60 after 1 year, and 61-80 after 2 and 3 years. The results reveal high annual rates of both vertical and horizontal transmission of N. caninum in a herd of beef cows and provide further validation on the ability of the N. caninum IgG avidity ELISA to accurately assess the chronicity of infection. |
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Authors:
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Camilla Björkman; Milton M McAllister; Jenny Frössling; Katarina Näslund; Felicia Leung; Arvid Uggla |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S. |
Journal Detail:
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Title: Journal of veterinary diagnostic investigation : official publication of the American Association of Veterinary Laboratory Diagnosticians, Inc Volume: 15 ISSN: 1040-6387 ISO Abbreviation: J. Vet. Diagn. Invest. Publication Date: 2003 Jan |
Date Detail:
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Created Date: 2003-02-12 Completed Date: 2003-06-04 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 9011490 Medline TA: J Vet Diagn Invest Country: United States |
Other Details:
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Languages: eng Pagination: 3-7 Citation Subset: IM |
Affiliation:
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Department of Ruminant Medicine and Veterinary Epidemiology, Swedish University of Agricultural Sciences, PO Box 7019, SE-750 07 Uppsala, Sweden. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Abortion, Veterinary
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complications,
immunology,
parasitology,
transmission Animals Antibody Affinity Cattle Cattle Diseases / epidemiology*, immunology, parasitology, transmission* Chronic Disease Coccidiosis / complications, epidemiology, transmission*, veterinary* Disease Outbreaks / veterinary Enzyme-Linked Immunosorbent Assay Female Immunoglobulin G / blood* Neospora / immunology* Pregnancy Pregnancy Complications, Infectious / immunology, parasitology, veterinary* Time Factors |
| Chemical | |
Reg. No./Substance:
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0/Immunoglobulin G |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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