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Pneumonia caused by biotype 2 strains of actinobacillus pleuropneumoniae in swine stocks



Pneumonia caused by biotype 2 strains of actinobacillus pleuropneumoniae in swine stocks



Magyar Allatorvosok Lapja 44(11): 669-674



Between 1982 and January 1989, during the laboratory investigation of 1263 pigs or piglets, originating from 12 stocks and died due to pneumonia, biotype 2 strains of Actinobacillus pleuropneumoniae were isolated from 27 (2.1%) 2 weeks-4 months old pigs. Haemorrhagic, croupous-necrotic pneumonia, accompanied with abundant exudation and fibrinous pleurisy was observed in the apical and diaphragmatic lobes of one lung in milder cases and in one of the lungs or in the major part of both lungs in more severe cases. Gross and histopathological changes are similar to the pneumonia caused by biotype 1 of A. pleuropneumoniae (previously known as Haemophilus pleuropneumoniae). Incidence of both biotypes of A. pleuropneumoniae was confirmed in pigs sent for laboratory investigation from two farms at different points of time. However, incidence of the disease caused by biotype 1 was always en masse, while losses associated with biotype 2 were always sporadic. During the serotypefying by passive haemagglutination, 14 of 27 strains belonged to the 1st serotype of biotype 2 A. pleuropneumoniae and 13 to the 2nd serotype. Serologically unclassifiable strains have not been isolated so far.

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