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The rapid recognition of Lancefield group B haemolytic streptococci
  1. R. J. Fallon
  1. Department of Laboratory Medicine, Ruchill Hospital, Glasgow

    Abstract

    When grown overnight on Columbia agar in an atmosphere of hydrogen and carbon dioxide, haemolytic strains of Lancefield group B streptococci (Streptococcus agalactiae) produce orange or brown pigmented colonies. This production of pigmented colonies can be used for the rapid presumptive identification of these organisms as belonging to group B without the need for grouping by serological methods.

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