Demonstration of α and β Components of Group B Streptococcal Protein Antigen c in Serum‐soft Agar

Abstract
Summary: Among 85 group B streptococcal cultures with protein type antigen c 56 cultures demonstrated a diffuse type of colony morphology in plain soft agar. The addition of monospecific antibodies against the protein antigen c components cα and cß converted specifically the colony morphology from diffuse to compact. According to this results the serum‐soft agar technique could also be used to further characterize individual cultures of group B streptococci with protein antigen c.

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