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511. Observations on the serological typing of group N (‘lactic’) streptococci
Published online by Cambridge University Press: 01 June 2009
Extract
1. Agglutinating type sera were prepared in rabbits for fourteen representative strains in a collection of sixty-eight group N (‘lactic’) streptococci.
2. Common type antigens, distinct for each named species, were found in strains of Str. lactis (inhibitory varieties), Str. diacetilactis and Str. cremoris.
3. Certain individuals in each of the named ‘groups’ contained additional heterologous antigens, some of which were identical to heterologous (but not the common) antigens in strains of other groups.
4. Quantitative differences in the representation of common antigens were also found.
5. Str. lactis OJ and Str. cremoris HP were shown to be mirror images of each other so far as their type antigens are concerned, containing two common type antigens in inverse proportions of 4:1 respectively. Str. lactis OJ possesses the ‘cremoris group’ type antigen, and the implications of this observation are discussed.
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