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An Abattoir Survey of Pneumonia and Pleuritis in Slaughter Weight Swine from 9 Selected Herds

En slaktehusundersøkelse over pneumoni og pleuritt hos slaktegris fra 9 utvalgte besetninger. III. Serologiske funn og deres sammenheng med patomorfologiske og mikrobiologiske funn

III. Serological Findings and their Relationship to Pathomorphological and Microbiological Findings

Acta Veterinaria Scandinavica volume 32, pages 79–88 (1991)Cite this article

Abstract

Blood samples from 777 pigs, originating from 9 different herds, were collected at slaughter and examined for antibodies to Mycoplasma hyopneumoniae and Actinobacillus (Haemophilus) pleuropneumoniae by the indirect hemagglutination assay (IHA) and the complement fixation (CF) test, respectively. Results were compared to pathological and microbiological findings. Antibodies to M. hyopneumoniae in positive titers of 1/80 or higher were found in 62 % of the samples. The relationship between positive IHA titers to M. hyopneumoniae and gross findings indicative of enzootic pneumonia of pigs (EPP), histological findings indicative of EPP, the isolation of M. hyopneumoniae and the demonstration of M. hyopneumoniae by indirect immunofluorescent testing ranged from 64 % to 68 %. No correlation was noted between positive IHA titers and the isolation of Mycoplasma flocculare. Positive antibody titers to A. pleuropneumoniae of 1/10 or higher were detected in 5 % to 85 % of the samples from individual herds. Positive titers to A. pleuropneumoniae serotype 2 were found in 71 % to 79 % of the sampled animals from herds with high frequencies of pneumonic lesions indicative of pleuropneumonia. In herds with low frequencies of pleuropneumonia, positive titers were recorded in from 0 to 4 % of the tested pigs. However, no statistical association was found between pleuropneumonia and positive titers to A. pleuropneumoniae serotype 2 in individual animals. Twenty-one per cent of samples with positive CF titers to A. pleuropneumoniae showed antibodies to more than one serotype.

Sammendrag

Blodprøver av 777 griser fra 9 forskjellige besetninger ble samlet inn ved slakting. Prøvene ble undersøkt for antistoffer mot Mycoplasma hyopneumoniae ved hjelp av indirekte hemagglutinasjonstest (IHA) og for antistoffer mot Actinobacillus (Haemophilus) pleuropneumoniae ved hjelp av komplementbindingstest (CF). Resultatene ble sammenholdt med patologiske og mikrobiologiske funn.

I denne undersøkelsen hadde 62 % av grisene et antistofftiter på 1/80 eller høyere mot M. hyopneumoniae. Sammenhengen mellom positive IHA-titre mot M. hyopneumoniae og patologiske funn som tydet på enzootisk pneumoni hos gris (EPP), dyrkning av M. hyopneumoniae og påvisning av M. hyopneumoniae ved hjelp av indirekte immunofluorescens test varierte fra 64 % til 68 %. Det ble ikke funnet noen sammenheng mellom positive IHA-titre og dyrkning av Mycoplasma flocculare.

Positive antistofftitre mot A. pleuropneumoniae på 1/10 eller høyere ble funnet i 62 % av prøvene. Denne frekvensen varierte fra 5 % til 85 % i de enkelte besetningene. I besetninger med høy frekvens av pleuropneumoni varierte frekvensen av griser med positive antistofftitre mot A. pleuropneumoniae serotype 2 fra 71 % til 79%. I besetninger med lav frekvens av pleuropneumoni varierte frekvensen av seropositive griser fra 0 til 4 %. Det ble imidlertid ikke funnet noen statistisk sammenheng mellom pleuropneumoni og antistoffer mot A. pleuropneumoniae hos enkeltdyr.

Enogtyve prosent av prøvene med positive CF titre mot A. pleuropneumoniae hadde antistofftitre mot flere enn én serotype.

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

    K. Falk & B. M. Lium

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  1. K. Falk
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Falk, K., Lium, B.M. An Abattoir Survey of Pneumonia and Pleuritis in Slaughter Weight Swine from 9 Selected Herds. Acta Vet Scand 32, 79–88 (1991). https://doi.org/10.1186/BF03546999

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Acta Veterinaria Scandinavica

ISSN: 1751-0147