Protection of Cattle against Epizootic Bovine Abortion (EBA) Using a Live Pajaroellobacter abortibovis Vaccine

Myra T. Blanchard, Mike B. Teglas, Mark L. Anderson, Peter F. Moore, Bret R. McNabb, Kassidy M. Collins, Bret V. Yeargan, Jeffrey L. Stott

Research output: Contribution to journalArticlepeer-review


Epizootic bovine abortion (EBA) is an arthropod-borne bacterial disease that causes significant economic loss for cattle producers in the western United States. The etiologic agent, Pajaroel-lobacter abortibovis, is an intracellular pathogen that has yet to be cultivated in vitro, thereby requiring novel methodologies for vaccine development. A vaccine candidate, using live P. abortibovis-infected cells (P.a-LIC) harvested from mouse spleens, was tested in beef cattle. Over the course of two safety studies and four efficacy trials, safety risks were evaluated, and dosage and potencies refined. No incidence of anaphylaxis, recognized health issues or significant impact upon conception rates were noted. Vaccination did result in subclinical skin reactions. Early fetal losses were noted in two trials and were significant when the vaccine was administered within 21 days prior to conception. Administration of the EBA agent (EBAA) vaccine as a single dose, at a potency of 500 P.a–LIC, 56 days prior to breeding, provided 100% protection with no early fetal losses. Seroconversion occurred in all animals following EBAA vaccination and corresponded well with protection of the fetus from epizootic bovine abortion.

Original languageEnglish (US)
Article number335
Issue number2
StatePublished - Feb 2022


  • Early fetal losses
  • EBAA vaccine
  • Epizootic bovine abortion (EBA)
  • Foothill abortion
  • Indirect fluorescent antibody test (IFAT)
  • Pajaroellobacter abortibovis
  • Serology

ASJC Scopus subject areas

  • Immunology
  • Pharmacology
  • Drug Discovery
  • Infectious Diseases
  • Pharmacology (medical)


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