A Cowan I strain of Staphylococcus aureus was labeled with either group B streptococcal grouping or typing antiserum. These antibody-labeled reagent cells (ARC) were used in a slide coagglutination test to identify and type group B streptococci from blood agar plates. All streptococci were also identified by the standard Lancefield capillary precipitin test. In a blind study, all 141 group B st...

As beta-haemolytic streptococci can be cultured in people with and in those without a sore throat, a case-control study was set up in 43 family practices in The Netherlands. The association was tested between the number of colony counts, specific T/M types and exotoxin genes and an acute sore throat. Duplicate throat swabs were taken from 663 sore-throat patients, selected by clinical criteria,...

Dental plaque was obtained from one or two sound root surfaces of subjects with different degrees of root-surface caries experience. From subjects with root-surface caries, plaque samples were also obtained from either one incipient or one more advanced lesion. Proportions of the total flora were determined for total streptococci and different streptococcal species, total and different Actinomy...

BACKGROUND In Pemba (Zanzibar) all the risk factors which favour Group A Streptococci spreading, infections and late sequelae are present, though GAS epidemiology is unknown. OBJECTIVE To determine the prevalence of GAS pharyngeal carriers among school-aged-children. DESIGN Community-based cross sectional study, carried out at the end of the dry season (January-February 2001). SETTING Eig...

The recognition of Lancefield's Group A as the most,commonly pathogenic members of the haemolytic streptococci has prompted several attempts at devising a rapid cultural diagnostic method such as the addition of maltose or glucose to blood agar, which alters the haemolytic activity of Group A strains (Kodama, 1937; Simmons and *Wilson, 1941). This paper describes the use of an antibiotic that i...

Reciprocal transformation reactions to streptomycin resistance have been demonstrated between pneumococcus and 2 strains of viridans streptococci, which by the usual bacteriological criteria are distantly related to pneumococcus. Desoxyribonucleic acid (DNA) extracts of a strain of streptomycin-resistant Streptococcus salivarius have been found capable of transforming pneumococcus and two strai...

Serologically reactive dextrans were synthesized from sucrose by 22 of 48 strains of streptococci isolated from the blood of patients with subacute bacterial endocarditis. One strain formed an appreciable amount of levan as well as dextran. Nine strains of group H streptococci from throats formed dextran serologically similar to that formed by the described endocarditis streptococci. Six strain...