SEROLOGIC STUDIES ON PORCINE STRAINS OF HAEMOPHILUS-PARAHAEMOLYTICUS (PLEUROPNEUMONIAE) - AGGLUTINATION REACTIONS

  • 1 January 1977
    • journal article
    • research article
    • Vol. 38  (8) , 1111-1114
Abstract
Fifteen strains of H. parahaemolyticus (H. pleuropneumoniae) represented by 6 American isolates, 6 Swedish isolates and 3 reference strains of Nicolet''s serotype, 1, 2 and 3 were used in agglutination and agglutinin-adsorption tests. By whole cell-agglutination tests in rabbit antisera, 3 additional serotypes, 4, 5 and 6, were identified. All strains had strong serotype-specific agglutinating properties. Occasional weak cross reactions could be eliminated by appropriate adsorptions without effect upon type-specific reactivity. The Swedish isolates were assigned to serotypes 2, 3, 4 and 6, and the American isolates, to serotypes 4 and 5. All European isolates were distinct from 5 of the 6 American strains. An American culture isolated from a steer and another from a lamb were identical in their agglutination reactions with the porcine isolates of serotype 5. The serotyping of isolated strains is important in the epizootiologic and immunologic studies of H. parahaemolyticus infections.

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