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Background  Respiratory 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.    Results  Pleuritic lesions registered at slaughter ranged from 20.5 to 33.1 % in the four herds. In herd A, the levels of serum antibodies to  A.   pleuropneumoniae  exceeded A 450  > 1.5, but not to any other microbe searched for. The seroconversion took place early during the fattening period. Similar levels of serum antibodies to  A.   pleuropneumoniae  were also recorded in herd B, with a subsequent increase in levels of antibodies to  P.   multocida . Pigs seroconverted to both agents during the early phase of the fattening period. In herd C, pigs seroconverted to  P.   multocida  during the early phase of the fattening period and thereafter to  A.   pleuropneumoniae . In herd D, the levels of antibodies to  P. multocida  exceeded A 450  > 1.0 in absence (A 450  < 0.5) of antibodies to  A.   pleuropneumoniae . The levels of serum antibodies to  M.   hyopneumoniae  and to  S.   suis  remained below A 450  < 1.0 in all four herds. Pigs seroconverted to  M.   hyopneumoniae  late during the rearing period (herd B–D), or not at all (herd A).    Conclusion  Different serological patterns were found in the four herds with high levels of serum antibodies to  A.   pleuropneumoniae  and  P.   multocida , either alone or in combination with each other. Seroconversion to  M.   hyopneumoniae  late during the rearing period or not at all, confirmed the positive effect of age segregated rearing in preventing or delaying infections with  M.   hyopneumoniae.  The results obtained highlight the necessity of diagnostic investigations to define the true disease pattern in herds with a high incidence of pleuritic lesions.

acta veterinaria scandinavica

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