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Serotypes of Streptococcus agalactiae cultured from dairy milk samples in Québec
Danielle Daignault1, Evelyne Guévremont, Jean-Marc Guillemette
1Laboratoire d'Hygiène vétérinaire et alimentaire, Santé Canada, 3400 Casavant Ouest, Saint-Hyacinthe, Québec J2S 8E3. danielle_daignault@hc-sc.gc.ca
Abstract:
Streptococcus agalactiae remains an important pathogen of dairy herds in Québec, but data about antigenic characteristics of this microorganism are sparse. This study was conducted to determine the variety of S. agalactiae serotypes in dairy herds in Québec. Two hundred and ninety-five isolates cultured from the milk of individual cows from 7 regions of Québec were serotyped. Sixty-two percent of the isolates were untypable. Among the 38% of typeable isolates, serotype III was found most frequently. In conclusion, the heterogeneity found among antigenic determinants of isolates from bovine milk suggests that an immunological method for the detection of S. agalactiae performed directly on bovine milk would not be a practical approach.