Prevalence of mycoplasma-like lung lesions in pigs from commercial farms from Spain and Portugal

Abstract Background Mycoplasma hyopneumoniae causes a chronic respiratory disease that produces important economic losses due to poor productive performance, increased mortality and costs for several control strategies. The prevalence of mycoplasma-like lesions (MLL) at abattoir has been widely studied in different countries, making use scoring systems. However, most them are difficult apply abattoirs with high number pigs sacrificed per hour. For reason, it is necessary adapt the system reality modern abattoir, even if there loss accuracy. Our purpose was investigate severity MLL Spain Portugal using 0 5 adapted hour highlight histopathological diagnosis as confirmatory method identify patterns pneumonia correlated gross lesions. Results Cranioventral pulmonary consolidation, typical MLL, frequent lung lesion (30.97 %) detected followed by dorsocaudal infarcts pleurisy (12.51 alone (6.26 %). average score all examined lungs 1.99 out points. study revealed 78.17 % randomly selected presented microscopic compatible M. infection. Most bronchointerstitial interstitial had course while suppurative fibrinous bronchopneumonia an acute higher degree severity. combination more frequently observed + bronchopneumonia. Conclusions 30.97 %, however, after examination real infection reduced up 24.21 %. six prevalent combinations involved 66.13 lungs, them, characteristic were found, what supports importance primary pathogen cases PRDC.