Document Detail

Associations between pregnancy outcome and serological response to Neospora caninum among a group of dairy heifers.
MedLine Citation:
PMID:  15846399     Owner:  NLM     Status:  MEDLINE    
AIM: To monitor pregnancy in a group of rising 2-year-old dairy heifers on a farm on which abortion due to Neospora caninum was known to occur in previous years. METHODS: A prospective cohort study group of 164 rising 2-year-old heifers was pregnancy-tested and blood-sampled at 4-5-week intervals throughout gestation. Sera were tested for antibodies to N. caninum at 3-4-month intervals, using an enzyme-linked immunosorbent assay (ELISA). When loss of pregnancy was detected, an N. caninum indirect fluorescent antibody test (IFAT) was conducted retrospectively on stored sera collected the month before abortion, the month abortion was detected, and for the following 2 months, from heifers that aborted. All fetal and placental material detected following abortion was subjected to gross post-mortem and histopathological examination. RESULTS: Eleven of 18 (61%) heifers that were seropositive and 4/146 (3%) heifers that were seronegative to N. caninum by ELISA, aborted. The relative risk for abortion among ELISA-positive heifers was 23.6. Abortion occurred predominantly between Days 120 and 152 gestation among the ELISA-positive heifers and throughout gestation among the ELISA-negative heifers. IFAT titres rose around the time of abortion in most of the heifers that were previously seropositive by ELISA, but dropped rapidly again in post-abortion samples. IFAT titres among 4/6 ELISA-positive heifers that did not abort increased, but later in gestation than the time other heifers aborted. IFAT titres remained negative in heifers that aborted that were ELISA negative. CONCLUSIONS: Heifers that were seropositive to N. caninum by ELISA had a much greater risk of abortion than seronegative heifers. Most seropositive heifers showed evidence of a reactivation of infection during pregnancy. High (> or =1:2,000) N. caninum IFAT titres also occurred in non-aborting heifers. CLINICAL RELEVANCE: Culling of replacement heifers seropositive to N. caninum may be a cost-effective strategy for minimising risk of abortion. Pregnancy testing heifers before 5 months gestation may overestimate the number that calve in N. caninum-infected herds, but would assist in documenting the occurrence of abortion. Reliance on a high (>1:2,000) IFAT titre to rule-in N. caninum as a cause of abortion is likely to produce false-positive results.
J F Weston; N B Williamson; W E Pomroy
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  New Zealand veterinary journal     Volume:  53     ISSN:  0048-0169     ISO Abbreviation:  N Z Vet J     Publication Date:  2005 Apr 
Date Detail:
Created Date:  2005-04-22     Completed Date:  2005-05-26     Revised Date:  2009-11-11    
Medline Journal Info:
Nlm Unique ID:  0021406     Medline TA:  N Z Vet J     Country:  New Zealand    
Other Details:
Languages:  eng     Pagination:  142-8     Citation Subset:  IM    
Institute of Veterinary, Animal and Biomedical Sciences, Massey University, Private Bag 11222, Palmerston North, New Zealand.
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MeSH Terms
Abortion, Veterinary / parasitology
Antibodies, Protozoan / biosynthesis,  blood*
Cattle Diseases / immunology*,  parasitology
Coccidiosis / complications,  immunology,  veterinary*
Cohort Studies
Enzyme-Linked Immunosorbent Assay / methods,  veterinary
Fluorescent Antibody Technique, Indirect / veterinary
Neospora / immunology*,  isolation & purification
Pregnancy Complications, Parasitic / immunology,  veterinary*
Pregnancy Outcome / veterinary
Prospective Studies
Risk Factors
Seroepidemiologic Studies
Reg. No./Substance:
0/Antibodies, Protozoan

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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