The biochemical characteristics of 172 clinical isolates of group A, C, F, or G or "nongroupable" beta-hemolytic streptococci were examined. Among these isolates, 91 were identified as beta-hemolytic strains of Streptococcus milleri. The remaining isolates included 20 Streptococcus pyogenes, 21 Streptococcus equisimilis, 37 large-colony group G streptococci, and 3 unidentified nongroupable isol...

The applicability to the non-hemolytic streptococci of the technique used for the extraction of a soluble precipitating substance from the hemolytic streptococci is demonstrated. With this substance as antigen, it is demonstrated by means of precipitation and complement fixation that the non-hemolytic streptococci form an antigenically distinct, but entirely heterogeneous group. Such cross-reac...

The bacteriophages of ~-hemolytic streptococci studied by Evans (1-4) were classified into several races or types. I t is clear from this early work that the phages demonstrated some degree of specificity for streptococcal groups. For instance, a bacteriophage which lysed almost all group C streptococci did not lyse group A streptococci. However, much of this work was done prior to the serologi...

objective(s): streptococcus pyogenes produces extracellular hyaluronidase enzyme. this enzyme is directly associated with the spread of the organism during infection. the objective of the present study was to clone and express the nucleotide sequence of the enzyme which is involved in hyaluronidase enzymatic activity. materials and methods: the enzymatic region of hyaluronidase gene was detecte...

The effects of selective media and atmosphere of incubation on the isolation of group A beta-hemolytic streptococci were evaluated. Sheep blood agar medium with gentamicin (2.5 or 5.0 mug/ml) was inferior to antibiotic-free sheep blood agar medium. This resulted from the partial restriction of group A streptococcal growth on gentamicin medium. Recovery of beta-hemolytic streptococci from specim...

Aim: Streptococcus pyogenes (Group A Beta-hemolytic streptococci, GABHS) is one of the important bacterial pathogens in clinical microbiology. It often causes upper respiratory tract infections such as tonsillitis, pharyngitis, and laryngitis. also leads to complications acute rheumatic fever post-streptococcal glomerulonephritis. Early diagnosis treatment these will prevent suppurative non-sup...

INTRODUCTION Studies on the carriage rate of beta-hemolytic streptococci among children form an important component of public health practice to prevent disease complications such as rheumatic fever/rheumatic heart disease, nephritis, and other local or systemic infections. METHODOLOGY Throat swabs collected from asymptomatic schoolchildren were inoculated into appropriate media for isolation...

A test is described that could replace bacitracin susceptibility for presumptive identification of group A streptococci as well as 6.5% NaCl agar tolerance for presumptive identification of enterococcal streptococci. The L-pyrrolidonyl-beta-naphthylamide test, based on hydrolysis of pyrrolidonyl-beta-naphthylamide, was used in conjunction with the CAMP and bile-esculin tests to presumptively id...