The cultural and biochemical characters of Streptococcus milleri strains isolated from human sources.

摘要: Abstract A collection of 346 strains Streptococcus milleri from a variety human sources was examined culturally and biochemically, for the presence Lancefield group antigens. Most were non-haemolytic ungroupable, but 25% β haemolytic 19% α haemolytic; 28% possessed antigen (A, 5%; C, 6%, F, 14%, G, 3%). These antigens present in 69% β-haemolytic only 13% α-haemolytic or strains; haemolysis occurred 82% group-F strains, 43% other groupable 11% ungroupable strains. The following reactions given by > 80% S. strains: hydrolysis arginine aesculin, positive Voges—Proskauer reaction, acidification trehalose, lactose, salicin sucrose. A minority showed enhancement growth CO2, bile tolerance, NaCl ability to acidify sugars, notably mannitol, raffinose melibiose. Departures modal pattern biochemical weak correlation with type absence not sufficiently systematic clear-cut subdivisions be recognized within species. S. therefore appeared comprise `central' that rarely formed Lancefield-group antigen, which aesculin reaction nearly always positive, lactose usually acidified, considerable CO2 tolerance. Deviations this two main types. (1) Loss'ofo≠ormoreofthesereactions,whichtended→beassociatedwithβ−haemolysisandpresenceofagroupanti≥n.Intheserespects,α−haemolyticstra∈stended→oupyan∫ermediateposition.(2)Loss′ofo≠ormoreofthesereactions,whichtended→beassociatedwithβ-haemolysisandpresenceofagroupanti≥n.Intheserespects,α-haemolyticstra∈stended→oupyan∫ermediateposition.(2)Gain' additional melibiose mannitol; mainly among otherwise typical groupable. Only 12% isolations bloodstream patients suffering systemic infections 18% considerably greater proportion those visceral abscesses (28%). Among superficial lesions some body sites there proportions thus, one-half isolated abdomen than female genital tract over groupable. On hand, teeth gums most vaginal wide sugar-fermentation pattern.