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Brucella abortus infection in the bull
Australian Veterinary Journal
|January 1, 1976
Summary
Two bulls exposed to Brucella abortus showed varied responses. One bull remained serologically positive and asymptomatic, while the other developed clinical signs and tested positive for Brucella abortus at autopsy.
Area of Science:
- Veterinary Medicine
- Infectious Diseases
- Bovine Reproduction
Background:
- Brucella abortus is a significant pathogen affecting cattle.
- Understanding bull susceptibility and disease progression is crucial for herd management.
- Previous studies on Brucella abortus in bulls have provided limited insights into clinical and subclinical infections.
Purpose of the Study:
- To report observations on two bulls naturally exposed to Brucella abortus.
- To document the clinical, serological, and microbiological findings in infected bulls.
- To contribute to the understanding of Brucella abortus infection dynamics in bulls.
Main Methods:
- Two bulls from a Brucella-infected property were monitored.
- Serological testing (SAT and CFT) was performed regularly.
- Semen was analyzed for Brucella abortus.
- Clinical examinations and post-mortem examination with histopathology were conducted.
Main Results:
- Bull 1 showed persistent serological reactions to Brucella abortus but no semen shedding or clinical signs.
- Bull 2 exhibited fluctuating serological status, developed epididymitis and orchitis, and Brucella abortus biotype 1 was isolated from reproductive organs at necropsy.
- Brucella abortus was not detected in semen samples from either bull during the observation period.
Conclusions:
- Brucella abortus infection in bulls can present with diverse clinical and serological outcomes.
- Diagnosis may be challenging due to intermittent shedding and variable serological responses.
- Further research is needed to refine diagnostic strategies for Brucella abortus in bulls.