Brucellosis Brucellosis in swine is caused by Brucella suis . Brucella organisms are also infectious to humans, but due to federal eradication programs very few cases are reported in people or livestock. Brucellosis is spread by direct contact with infected tissues, primarily aborted fetuses and membranes. Boars can develop a persistent infection and shed bacteria in the semen, which contributes to the spread of this disease. Females that become infected at breeding may abort at any stage of gestation.
Antibiotics are of little value in treating brucellosis.
The prevalence of swine brucellosis has been reduced to the point that vaccination is not practical. Management practices for maintaining a brucellosis-free herd status are encouraged. The human health risks of brucellosis should always be considered when handling any aborted fetuses or fetal membranes. This virus is found in most swine herds, but previously exposed animals develop immunity. Porcine parvovirus will cross the placenta and infect developing fetuses.