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. 1991;32(1):67-77.
doi: 10.1186/BF03546998.

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

K Falk  1 , S Høie, B M Lium
Affiliations

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

K Falk et al. Acta Vet Scand. 1991.

Abstract
in English, Norwegian

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 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 Mycoplasma 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. hyopneumoniae, P. multocida and M. hyorhinis present. The amounts of pneumonia in lungs with M. hyopneumoniae alone and in concurrence with P. multocida, were 9.3% and 15.6%, respectively. M. hyorhinis was also, in this study, associated with higher frequency of diffuse pleuritis. These findings indicate that 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 most severe pneumonia problems, toxin production was detected in 83% of the P. multocida strains while only 28% were toxigenic in herds with subclinical to moderate pneumonia problems.

Hundreognitten slaktegrislunger med patologiske forandringer som kunne tyde på enzootisk pneumoni hos gris (EPP), samt 80 lunger med normalt utseende, ble undersøkt patologisk og mikrobiologisk. De stammet alle fra 9 utvalgte besetninger. De mikrobiologiske undersøkelsene omfattet dyrkning med hensyn på både bakterier og mykoplasmer. I tillegg ble indirekte immunfluorescensteknikk anvendt for påvisning av Mycoplasma hyopneumoniae i lungevev.

M. hyopneumoniae, Pasteurella multocida og Mycoplasma hyorhinis ble påvist i henholdsvis 83 %, 43 % og 37 % av de pneumoniske lungene. Mycoplasma flocculare var den vanligst påviste mikroorganismen i normale lunger.

Enkeltlunger der både M. hyopneumoniae, Pasteurella multocida og Mycoplasma hyorhinis ble påvist, hadde størst utbredelse av pneumoni (25.2 %). I lunger der M. hyopneumoniae ble påvist alene eller i kombinasjon med P. multocida, var utbredelsen av pneumoni henholdsvis 9.3 % og 15.6 %. I denne undersøkelsen ble det også påvist en sammenheng mellom forekomst av M. hyorhinis og diffus pleuritt. Disse funnene tyder på at M. hyorhinis har betydning for patogenesen ved pneumoni hos slaktegris.

Nittiseks prosent av P. multocida isolatene fra pneumoniske lunger var type A. Fra de besetningene som hadde de mest uttalte pneumoniproblemene, ble toksinproduksjon påvist hos 83 % av de isolerte P. multocida stammene, mens bare 28 % av stammene fra de besetningene som hadde moderate pneumoniproblemer var toksinogene.

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