B151 - OVINE EPIDIDYMITIS (BRUCELLA OVIS)

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B151 - OVINE EPIDIDYMITIS (BRUCELLA OVIS)

Nature of the disease
Ovine Epididymitis is due to the infection by Brucella ovis. It is characterised by infertility in rams and placentitis in ewes.
Classification
OIE, List B disease
Susceptible species
Ovine. Experimentally goats and deers can be infected. There is no evidence of human infection.
Distribution
Worldwide, present in Australia and in New Zealand
Clinical signs
In rams: epididymitis
In ewes: placentitis, abortion, neonatality, infertility
Post-mortem findings
Not applicable
Differential diagnosis
Specimens required for diagnosis
B. ovis can be isolated from semen samples or tissues of rams, or vaginal discharges and milk of ewes and observed in stained preparation or detected by PCR.

Serological tests have been developed and include double agar gel immunodiffusion, complement fixation ELISA.

Transmission
Transmission is by sexual contact from ram to ewe or from ram to ram.
Risk of introduction
B. ovis could be introduced via importation of infected animals or semen.
Control / vaccines
A commercial vaccine is available and should be considered where B. ovis has a high incidence of infection. For long-term control serological testing and B.-ovis-free accreditation programmes have to be implemented.
References