What is a typical clinical sign of Brucella suis infection?

Brucella suis is a bacterial infection specifically affecting swine, and one of its hallmark clinical signs in infected sows and gilts is abortion. This often occurs between the third and fourth trimester of gestation and can result in severe reproductive losses within affected herds. In addition to abortion, Brucella suis can cause other reproductive issues, such as stillbirths and the birth of weak piglets. The immunological response prompted by the infection can significantly disrupt reproductive health, leading to the observable sign of abortion, which veterinarians closely monitor in breeding stock to manage herd health effectively.

Other options, while they may indicate different health issues, are not characteristic of Brucella suis infections. Weight gain is typically a sign of good health in livestock, excessive salivation is more common in other diseases affecting oral health, and skin lesions might indicate a different type of infection or condition entirely. Therefore, the clear link between Brucella suis and abortion makes it the correct choice here.