Dynamics of Coxiella burnetii antibodies and seroconversion in a dairy cow herd with endemic infection and excreting high numbers of the bacterium in the bulk tank milk

Possible factors related to seropositivity and seroconversion to Coxiella burnetii were examined in a dairy herd with a high Coxiella-seroprevalence and high excretion levels of the bacterium in the bulk tank milk. Antibodies were detected by using a commercial ELISA test in 50.7% of 603 parous cows...

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Bibliographic Details
Published in:Research in veterinary science 2012-12, Vol.93 (3), p.1211-1212
Main Authors: Nogareda, C., Almería, S., Serrano, B., García-Ispierto, I., López-Gatius, F.
Format: Article
Language:English
Subjects:
Abortion
Animals
antibodies
Antibodies, Bacterial - blood
Bacteria
Cattle
Cattle Diseases - microbiology
Confidence intervals
Coxiella burnetii
Coxiella burnetii - immunology
Dairy cows
dairy herds
Dairying
enzyme-linked immunosorbent assay
excretion
Female
Fertility
Infections
Logistic Models
Logistics
Milk
Milk - microbiology
Natural infection
Pregnancy
Q fever
Q Fever - immunology
Q Fever - microbiology
Q Fever - veterinary
Risk Factors
seroconversion
Serology dynamics
seroprevalence
Studies
Veterinary medicine
Zoonosis
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Summary:Possible factors related to seropositivity and seroconversion to Coxiella burnetii were examined in a dairy herd with a high Coxiella-seroprevalence and high excretion levels of the bacterium in the bulk tank milk. Antibodies were detected by using a commercial ELISA test in 50.7% of 603 parous cows. The likelihood of C. burnetii seropositivity significantly increased by factors of 1.87 and 1.61 for cows in their first and second terms of pregnancy, respectively, compared to non-pregnant cows. In 478 cows tested twice 12months apart, the seroconversion rate was 5%. The likelihood of C. burnetii-seroconversion was 2.27 times lower in multiparous than in primiparous cows and 6.88 times higher in cows during their first 90days in milk than dry-off cows. Our findings indicated a higher seroprevalence in the first and second terms of pregnancy, and that seroconversion mainly occurred in primiparous cows during their first 90days in milk.
ISSN:0034-5288
1532-2661
DOI:10.1016/j.rvsc.2012.03.003