An Abattoir Survey of Pneumonia and Pleuritis in Slaughter Weight Swine from 9 Selected Herds
Acta Veterinaria Scandinavica
FaIk, K., S Hale and B. M . Lium: An abattoir survey of pneumonia and pleuritis in slaughter weight swine from 9 selected herds. II. Enzootic pneumonia of pigs: Microbiological findings and their relationship to pathomorphology. Acta vet. scand. 1991,32,67-77. -Lungs from 191 slaughter pigs with gross lesions indicative of enzootic pneumonia of pigs (EPP) and 80 grossly normal lungs , all originating from 9 different herds, were subjected to microbiological and pathological examinations. The
... xaminations. The microbiological studies included both bacterial and mycoplasmal culture and also testing for Mycoplasma hyopneumoniae antigen in tissue by indirect immunofluorescent technique. M . hyopneumoniae. Pasteurella multocida and M ycoplasm a hyorhinis were detected in 83 %, 43 % and 37 % of the pneumonic lungs , respectively. Mycoplasma flocculare was the most frequently isolated organism in the non-pneumonic lungs . The greatest amounts of macroscopic pneumonia (25.2 %) were recorded in lungs with all the three agents M . hyopneumo niae, P. multocida and M . hyorhinis pre sent. The an mounts of pneumonia in lungs with M . hyopneum oniae alone and in concurrence with P. mult ocida, were 9.3 % and 15.6 %, respectively. M . hyorhinis was also , in thi s stud y, associated with higher frequen cy of diffuse pleuritis. These findings indicate tha t M. hyorhinis might be involved in the pathogenesis of pneumonia in slaughter pigs. Ninety-six per cent of the isolates of P. multocida from pneumonic lungs could be characterized as type A. In the herds which had the mo st severe pneumonia problems, toxin production was detected in 83 % of the P. multocida strai ns while onl y 28 % were toxigen ic in herds with subclinical to moderate pneumonia problems. m ycoplasmas ; M ycoplasma h yop neum onia e; M ycopla sma hyorhin is; M ycoplasma fl occulare; bacteriology; Pa st eurella multocida .