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Transfer of haemophilus pleuropneumoniae and the pasteurella haemolytica like organism causing porcine necrotic pleuro pneumonia to the genus actinobacillus actinobacillus pleuropneumoniae new combination on the basis of phenotypic and dna relatedness

Transfer of haemophilus pleuropneumoniae and the pasteurella haemolytica like organism causing porcine necrotic pleuro pneumonia to the genus actinobacillus actinobacillus pleuropneumoniae new combination on the basis of phenotypic and dna relatedness

International Journal of Systematic Bacteriology 33(3): 510-514

The Pasteurella-like organism of porcine necrotizing pleuropneumonia described by Bertschinger and Seifert in 1978 phenotypically similar to the V factor-requiring strains hitherto classified as H. pleuropneumoniae (Mathews and Pattison 1961) Shope 1964. DNA-DNA hybridization experiments in which the optical method was used yielded 91% binding of the genomes of the type and reference strains of these 2 taxa, indicating that they belong to the same species. The levels of DNA binding between these strains and the type strain of H. influenzae indicated no measurable relatedness. These organisms do not belong to the genus Haemophilus sensu stricto, but they are closely related to A. lignieresii, as determined by phenotypic characteristics and DNA base sequence relatedness (72-75% binding). To take into account the different host ranges of these organisms, it is proposed to classify them as a species distinct from but closely related to, A. lignieresii, under the new combination A. pleuropneumoniae. The emended species A. pleuropneumoniae is composed of V factor-requiring and V factor-independent biovars. The type strain (strain Shope 4047 [= CCM 5869 = ATCC 27088]) requires V factor; the V factor-independent biovar is represented by strain Bertschinger 2008/76 (= Frederiksen P597 = HIM 677-3/4).

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