Mycoplasma hyopneumoniae: serology/vaccinology

摘要

Mycoplasmal pneumonia has been a problem for growing pigs probably before it was identified as a pig disease in the 1930s and certainly before the cause was determined in 1965. The clinical expression of disease has been described as a non-productive cough that begins about 1 month after nursery pigs are placed into continuous flow finishing units. The cough persists in individual pigs for 4 to 6 weeks and then, gradually diminishes. In populations, the cough may appear to persist throughout the growing period as different pigs become infected and recover. Without secondary infections, the disease has little affect of growth performance and does not cause death. However, Mycoplasma (M) hyopneumoniae infections are generally accompanied by secondary Pasteurella (P) multocida and other bacterial infections that colonize the damage airways and cause much more serious pneumonic lesions. The dual infection is commonly called enzootic or mycoplasmal pneumonia and pigs develop fevers, dyspnea, and may die if not treated with appropriate antibiotics.