title: Comparison of three tests for virulent Yersinia enterocolitica.
abstract: Magnesium oxalate agar was found to select against virulent types of Yersinia enterocolitica. Small colonies isolated from magnesium oxalate agar which were presumably virulent generally contained no detectable virulence-specific plasmids, did not agglutinate with virulence-specific antiserum, and exhibited various degrees of virulence in mice. Results indicate that the virulence potential of a Y. enterocolitica isolate cannot always be identified by these in vitro methods and suggest that virulence also involves other factors yet to be identified.
mesh_terms: D000372:Agglutination Tests; D000818:Animals; D003470:Culture Media; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D010070:Oxalates / Q000494:pharmacology; D019815:Oxalic Acid; D010957:Plasmids; D014774:Virulence; D015008:Yersinia enterocolitica / Q000302:isolation & purification / Q000472:pathogenicity*
chemical_list: D003470:Culture Media; D010070:Oxalates; D019815:Oxalic Acid