Further studies of twitching Streptococcus sanguis isolated from the human throat. Isolation of strains with a new antigen.
alpha-haemolytic streptococci, classified as Streptococcus sanguis, with spreading growth due to twitching mobility were isolated from 41% of 121 swab cultures from the human pharynx. Sixty-five out of 70 isolates with spreading growth belonged to Lancefield's group H, while 5 isolates constituted a new serological entity. None of 159 non-spreading alpha-haemolytic streptococci isolated from the same cultures possessed either of these antigens. An examination of strains of types I, II and I/II described by Washburn et al., in the group H antisera employed in the present study indicated that type I and type I/II differ from one another in the degree of cross-reactivity with anti-type II serum. (The type II antigen was not demonstrated in any of the isolated strains). We support the opinion that type II should not be considered as S. sanguis.
D000942:Antigens, Bacterial / Q000032:analysis; D011232:Chemical Precipitation; D006801:Humans; D005779:Immunodiffusion; D010614:Pharynx / Q000382:microbiology*; D012703:Serotyping; D013298:Streptococcus sanguis / Q000276:immunology / Q000302:isolation & purification* / Q000378:metabolism
D000942:Antigens, Bacterial