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Published on: July 22, 2011
Serological identification of Streptococcus salivarius subsp. thermophilus
M A Nour1, G Abdel-Tawab, S Shalaby
1Faculty of Agriculture, Al-Azhar University, Cairo, Egypt.
Abstract:
Streptococcus salivarius subsp. thermophilus (Str. thermophilus) has no group-specific antigen. HCl extracts of 551 strains of streptococci isolated from cheese or yogurt (123 Str. thermophilus and 428 Enterococcus faecalis - Ent. faecium spp.) were examined with three type-specific antisera prepared against representatives of Str. thermophilus and also with Lancefield group D antisera. All typical (80) or atypical (43) strains of Str. thermophilus reacted with at least one type-specific antiserum and none of the enterococci reacted. Only two strains reacted with both type-specific and group antisera.
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