Serological patterns of Actinobacillus pleuropneumoniae Mycoplasma hyopneumoniae Pasteurella multocida and Streptococcus suis in pig herds affected by pleuritis

摘要

BackgroundRespiratory illness is traditionally regarded as the disease of the growing pig, and has historically mainly been associated to bacterial infections with focus on Mycoplasma hyopneumoniae and Actinobacillus pleuropneumoniae. These bacteria still are of great importance, but continuously increasing herd sizes have complicated the scenario and the influence of secondary invaders may have been increased. The aim of this study was to evaluate the presence of A. pleuropneumoniae and M. hyopneumoniae, as well as that of the secondary invaders Pasteurella multocida and Streptococcus suis by serology in four pig herds (A–D) using age segregated rearing systems with high incidences of pleuritic lesions at slaughter.