A chronic, clinically mild, infectious pneumonia of pigs caused by mycoplasma hyopneumoniae. Ninety percent of swine herds worldwide are infected with this economically costly disease that primarily affects animals aged two to six months old. The disease can be associated with porcine respiratory disease complex. pasteurella multocida is often found as a secondary infection.
A chronic, clinically mild, infectious pneumonia of pigs caused by mycoplasma hyopneumoniae. Ninety percent of swine herds worldwide are infected with this economically costly disease that primarily affects animals aged two to six months old. The disease can be associated with porcine respiratory disease complex. pasteurella multocida is often found as a secondary infection.
Content last reviewed: 2026-06