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An Abattoir Survey of Pneumonia and Pleuritis in Slaughter Weight Swine From 9 Selected Herds. IV. Bacteriological Findings in Chronic Pneumonic Lesions

En slaktehusundersøkelse over pneumoni og pleuritt har slaktegris fra 9 utvalgte besetninger. IV. Bakteriologisk funn i kroniske lungelesjoner.

Acta Veterinaria Scandinavica volume 32, pages 395–402 (1991)Cite this article

Abstract

A total of 855 pig lungs were collected at slaughter and evaluated macroscopically. Bacteriological examinations were carried out on tissue samples from chronic Pleuropneumonic lesions (n= 196) and from chronic bronchopneumonic lesions with suppuration (n = 14). Samples from normal lung tissue (n = 22) were also included. Pasteurella multocida was isolated from 54%, Actinobacillus (Haemophilus) pleuropneumoniae from 11%, and Streptococcus spp. from 14% of the pneumonic lesions, respectively. From normal lung tissue P. multocida was isolated from 3 (14%) of the samples, A. pleuropneumoniae was not recovered and streptococci were isolated from only 1 (5%) of these samples. The above mentioned bacterial species were recovered either in pure cultures or mixed with various other microbes. A total of 109 P. multocida strains were further characterized by capsular serotyping and testing for production of dermonecrotic toxin. Ninety-nine (91%) of the strains were capsular type A 10 (9%) were type D. Out of the type A and the type D strains 94% and 90% were toxigenic, respectively. Most of the A. pleuropneumoniae strains were serotype 2. Strains of serotypes 1 and 7 were also identified. The majority of the streptococci were identified as either Streptococcus suis or Streptococcus dysgalactiae. Actinomyces pyogenes was isolated from 14% of the lesions and anaerobic bacteria from 18%, respectively. The significance of the various bacterial species in relation to the development of chronic pneumonic lesions is discussed. Special attention is paid to P. multocida, and it is concluded that this bacterial species is probably of importance for the development of both types of chronic pneumonias.

Sammendrag

Lunger fra 855 slaktegriser fra 9 utvalgte besetninger ble samlet inn ved slakting og undersøkt makroskopisk. Prøver fra 196 kroniske pleuropneumoniske lesjoner, fra 14 kroniske bronkopneumoniske lesjoner med suppurasjon og fra 22 normallunger ble undersøkt bakteriologisk.

Pasteurella multocida, Actinobacillus (Haemophilus) pleuropneumoniae og Streptococcus spp. ble påvist fra henholdsvis 54%, 11 % og 14% av lungelesjonene. Fra normalt lungevev ble P. multocida isolert fra 3 (14%) av prøvene, A. pleuropneumoniae ble ikke påvist og streptokokker ble funnet i bare ett tilfelle. De ovenfor nevnte bakteriearter ble påvist enten i renkultur eller som del av en blandingsflora.

Kapseltyping og testing for produksjon av dermonekrotisk toksin ble utført på 109 P. multocida stammer. Tre av disse stammet fra normalt lungevev. Nittini (91%) av stammene var kapseltype A og 10 (9%) var kapseltype D. Av type A og type D stammene var henholdsvis 94% og 90% toksinproduserende. To av stammene fra normalt lungevev var type A og 1 var type D. Alle 3 var positive i testen for toksinproduksjon.

De fleste av A. pleuropneumoniae stammene var serotype 2. Serotype 1 og 7 ble også identifisert.

De fleste streptokokkstammene ble identifisert enten som Streptococcus suis eller som Streptococcus dysgalactiae.

Actinomyces pyogenes og anaerobe bakterier ble isolert fra henholdsvis 14% og 18% av lesjonene.

Betydningen av de forskjeilige bakteriearter i relasjon til utvikling av kronisk pneumoni ble diskutert. P. multocida ble viet spesiell oppmerksomhet, og det ble konkludert med at denne bakteriearten sannsynligvis har betydning for utviklingen av begge typer kroniske pneumonier.

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  1. National Veterinary Institute, P. O. Box 8156, Dep., N-0033, Oslo 1, Norway

    Steinar Høie, Knut Falk & Bjørn M. Lium

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  1. Steinar Høie
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  2. Knut Falk
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Høie, S., Falk, K. & Lium, B.M. An Abattoir Survey of Pneumonia and Pleuritis in Slaughter Weight Swine From 9 Selected Herds. IV. Bacteriological Findings in Chronic Pneumonic Lesions. Acta Vet Scand 32, 395–402 (1991). https://doi.org/10.1186/BF03546970

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Acta Veterinaria Scandinavica

ISSN: 1751-0147