The rapid recognition of Lancefield group B haemolytic streptococci.
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.
D000332:Aerobiosis; D003470:Culture Media; D006801:Humans; D006863:Hydrogen-Ion Concentration; D008029:Lighting; D010858:Pigmentation; D013171:Spores, Bacterial; D013292:Streptococcus agalactiae / Q000254:growth & development / Q000302:isolation & purification*
D003470:Culture Media