Abortion and premature birth in cattle following vaccination with Brucella abortus strain RB51
| Autor: | Amanda M. Fluegel Dougherty, Todd E. Cornish, Owen L. Henderson, Amy M. Boerger-Fields, Donal O’Toole, Kenneth W. Mills |
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| Rok vydání: | 2013 |
| Předmět: |
Wyoming
Veterinary medicine animal diseases Brucella abortus Cattle Diseases Abortion complex mixtures Brucellosis law.invention Disease Outbreaks Brucella abortus strain RB51 law Pregnancy medicine Animals reproductive and urinary physiology Polymerase chain reaction General Veterinary business.industry Histocytochemistry Vaccination Abortion Veterinary medicine.disease Virology Premature birth Aborted Fetus Bacterial Vaccines Herd Cattle Female business |
| Zdroj: | Journal of veterinary diagnostic investigation : official publication of the American Association of Veterinary Laboratory Diagnosticians, Inc. 25(5) |
| ISSN: | 1943-4936 |
| Popis: | Brucella abortus RB51 is the vaccine strain currently licensed for immunizing cattle against brucellosis in the United States. Most cattle are vaccinated as heifer calves at 4–12 months of age. Adult cattle may be vaccinated in selected high-risk situations. Two herds of pregnant adult cattle in the brucellosis-endemic area of Wyoming were vaccinated with a standard label dose (1.0–3.4 × 1010 organisms) of RB51. Reproductive losses in the vaccinated herds were 5.3% (herd A) and 0.6% (herd B) and included abortions, stillbirths, premature calves, and unbred cows (presumed early abortion). Brucella abortus was cultured from multiple tissues of aborted and premature calves (7/9), and from placenta. Isolates were identified as B. abortus strain RB51 by standard strain typing procedures and a species-specific polymerase chain reaction. Bronchopneumonia with intralesional bacteria and placentitis were observed microscopically. There was no evidence of involvement of other infectious or toxic causes of abortion. Producers, veterinarians, and laboratory staff should be alert to the risk of abortion when pregnant cattle are vaccinated with RB51, to potential human exposure, and to the importance of distinguishing field from vaccinal strains of B. abortus. |
| Databáze: | OpenAIRE |
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