High Quality Content by WIKIPEDIA articles! Swine brucellosis is a zoonosis affecting pigs, caused by the bacteria Brucella suis. The disease typically causes chronic inflammatory lesions in the reproductive organs of susceptible animals or orchitis and may even affect joints and other organs. The most common symptom is abortion in pregnant susceptible hosts at any stage of gestation. Other manifestations are temporary or permanent sterility, lameness, posterior paralysis, spondylitis, and abscess formation. It is transmitted mainly by ingestion of infected tissues or fluids, semen during breeding, and suckling infected animals. In humans, it can cause undulant fever.