Associations between Campylobacter fetus, Haemophilus somnus, Leptospira hardjo and bovine viral diarrhea virus antibody titers in dairy cattle from a California herd

Saeed Akhtar, Thomas B Farver, Hans P. Riemann

Research output: Contribution to journalArticle


In a cross-sectional study, the associations of age, serological status against Campylobacter fetus (CF), Haemophilus somnus (HS) and Leptospira hardjo (LH) with the seroprevalence of bovine viral diarrhea virus (BVDV) in dairy cattle were evaluated. Six hundred and thirty cattle from a herd in Tulare county of California were included in the study. Blood samples from the cattle were collected in December 1986. Enzyme-linked immunosorbant assay (ELISA) was used to determine the positive or negative status of cows against CF, HS, LH and BVDV antigens. Loglinear analysis was used to describe the relationships of four categorical variables with the seroprevalence of BVDV. The final loglinear model was interpreted as a logit model and obtained by conditioning on explanatory variables in the model found to relate significantly with BVDV seropositivity. The hierarchical logit model included two two-way interactions (BVDV × HS and BVDV × LH) and a three-way interaction (BVDV × CF × age). HS-seronegative cattle had 4.7 times greater odds of being BVDV-seropositive compared with HS-seropositive cattle. In contrast, LH-seropositive cattle had 2.7 times increased odds of BVDV seropositivity compared with LH-seronegative cattle. The presence of the three-way interaction term in the model involving age, CF and BVDV seroprevalence implies that among heifers, CF-seronegative and CF-seropositive animals had about the same odds of BVDV seropositivity (e.g. adjusted odds ratios = 20.5 vs. 24.5), whereas, among cows, CF-seronegative animals had at least twice the odds of being BVDV-seropositive than those of CF-seropositive animals (e.g. adjusted odds ratios = 23.0 vs. 11.0).

Original languageEnglish (US)
Pages (from-to)125-134
Number of pages10
JournalPreventive Veterinary Medicine
Issue number3-4
StatePublished - Jul 1996



  • Bovine viral diarrhea virus
  • Campylobacter fetus
  • Haemophilus somnus
  • Leptospira hardjo
  • Loglinear model
  • Serology

ASJC Scopus subject areas

  • Animal Science and Zoology
  • veterinary(all)

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