Role of beta-hemolytic group C streptococci in pharyngitis: incidence and biochemical characteristics of Streptococcus equisimilis and Streptococcus anginosus in patients and healthy controls.

摘要: The biochemical characteristics and the isolation rates of two Lancefield group C streptococcal species (S. equisimilis S. anginosus) from patients with pharyngitis asymptomatic controls were compared. Some 239 strains beta-hemolytic streptococci isolated 1,480 (209 strains) 227 (30 strains). A total 44 displayed broad hemolysis, Voges-Proskauer test negative, produced glucuronidase. 72.7% these also fermented ribose. second 159 was positive glucuronidase negative; 98.8% minute hemolysis only 3.7% These groups represent typical large-colony small-colony anginosus, respectively. small number (36 in total) exhibited intermediate characteristics; morphologically, all 36 resembled but 6 biochemically equisimilis. No sorbitol (unlike zooepidemicus) trehalose equi). structural carbohydrate profiles anginosus both included galactosamine (consistent their being organisms), not distinguishable. In total, 78.5% 83.3% determined to be anginosus. 3.0% 2.2% controls, 11.1% 11.0% controls. Thus, are members normal flora individuals. incidence similar who healthy those have disease. However, a companion article provides clinical evidence associating (but s. pharyngitis.