Abstract
Eight strains of Haemophilus pleuropneumoniae isolated from 8 herd outbreaks of pleuropneumonia in pigs were studied by means of the slide agglutination test, the tube agglutination test, the IHA test and by gel diffusion. The 8 strains were antigenically homogeneous and serologically distinct from serotypes 1 through 7. It is therefore proposed to refer these strains to a new serotype: serotype 8, with strain 405 as the type strain. In addition to the serotype-specific capsular antigens, capsular antigen of serotype 3 (strain 1421) and serotype 6 (strain Femo) could be demonstrated in the 8 strains by means of the IHA test and by gel diffusion analyses.
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