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A comparative study of spirochaetes from the porcine alimentary tract

A comparative study of spirochaetes from the porcine alimentary tract

Journal of Hygiene 86(2): 173-182

Strains of Treponema hyodysenteriae capable of inducing swine dysentery in specific pathogen-free pigs were compared with other spirochetes from the porcine alimentary tract by biochemical and serological tests, and by electrophoresis of their proteins. Carbohydrate fermentation and esculin hydrolysis were similar in all the spirochetes. Indole was produced by T. hyodysenteriae and by some of the other spirochetes. Analysis of the fatty acids produced from glucose showed a difference between T. hyodysenteriae and other spirochetes only in the amount on n-butyric acid produced. The indirect fluorescent antibody test showed extensive cross-reactions between all the spirochetes unless antisera were first absorbed. A microtiter agglutination test and a growth inhibition test were both more specific; strains of T. hyodysenteriae could be distinguished from the other spirochetes using unabsorbed sera. Both tests revealed some antigenic heterogeneity among strains of T. hyodysenteriae. The cell proteins of a single strain of T. hyodysenteriae gave an electrophoretic pattern distinct from those of the other spirochetes. Two of the 6 spirochetes not associated with swine dysentery, PWS/B and PWS/C, were indistinguishable serologically and electrophoretically. The other 4 strains were serologically distinct from one another and from PWS/B and PWS/C. Only 2 of these spirochetes were examined electrophoretically, but each gave a different pattern from PWS/B and PWS/C. The diversity observed among spirochetes not associated with swine dysentery indicates that their suggested inclusion in a single species, T. innocens, may be unjustified.

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Accession: 000804706

Download citation: RISBibTeXText

PMID: 7462601

DOI: 10.1017/s0022172400068881

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