STUDIES ON A NON-HEMOLYTIC STREPTOCOCCUS ISOLATED FROM THE RESPIRATORY TRACT OF HUMAN BEINGS : III. IMMUNOLOGICAL RELATIONSHIP OF STREPTOCOCCUS MG TO STREPTOCOCCUS SALIVARIUS TYPE I

The results of studies on the immunological relationship between streptococcus MG and Streptococcus salivarius type I are described. Evidence is presented to show that Streptococcus salivarius type I, like streptococcus MG, possesses a capsular polysaccharide antigen. Similarities in the capsular polysaccharides of these two different species of non-hemolytic streptococci appear to be responsible for their immunological relationship.