Abstract
A reference antigen-antibody system for Streptococcus intermedius, Streptococcus constellatus, and Streptococcus morbillorum was established with crossed immunoelectrophoresis. A comparison of S. intermedius, S. constellatus, and S. morbillorum with crossed immunoelectrophoresis and crossed immunoelectrophoresis with intermediate gel indicated that S. intermedius and S. constellatus are closely related antigenically with as many as six common cytoplasmic antigens. S. morbillorum was antigenically more distinct; antiserum of one strain of S. morbillorum was monospecific, indicating that specific serogroups of S. morbillorum exist. Crossed immunoelectrophoresis and tandem crossed immunoelectrophoresis revealed that S. intermedius, S. constellatus, and S. morbillorum also share some common antigens with Streptococcus sanguis and Streptococcus mitis, but S. intermedius, S. constellatus, and S. morbillorum are antigenically distinct from Streptococcus mutans and Streptococcus bovis.
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