RESUMO
Pulse-electrophoresis, sequencing of emm genes coding protein M and PCR analysis of speA, speB, and speC genes were used for characterization of group A streptococci (GAS) isolated in different years in Moscow and Tuapse mostly from children and military staff. It has been shown that epidemic process of streptococcal infection caused by GAS in Moscow is based on circulation of many independent clones of Streptococcus pyogenes. Obtained data on complex typing of S. pyogenes would be useful for study of molecular epidemiology of diseases caused by GAS and improvement of epidemiologic surveillance.
Assuntos
Epidemiologia Molecular , Infecções Estreptocócicas/epidemiologia , Streptococcus pyogenes/classificação , Adulto , Antígenos de Bactérias/genética , Proteínas da Membrana Bacteriana Externa/genética , Proteínas de Bactérias/genética , Proteínas de Transporte/genética , Creches , Pré-Escolar , Eletroforese em Gel de Campo Pulsado , Exotoxinas/genética , Feminino , Humanos , Masculino , Proteínas de Membrana/genética , Militares , Federação Russa/epidemiologia , Streptococcus pyogenes/genética , Superantígenos/genética , População UrbanaRESUMO
Pulse electrophoresis of group A streptococci (GAS) isolated in 1998 - 2004 in Moscow from patients during outbreaks of tonsillitis in child institutions, military unit and also from sporadic cases in children and adults was performed. During analysis of 48 strains 16 pulse electrotypes were recognized. These data allow to consider that in different child institutions (and other groups) accumulation and spreading of most adapted to such environment variants of GAS are take place and population structure of GAS in such institutions is unique on molecular and other characteristics. This study showed that complex typing of GAS (use of pulse electrophoresis and PCR for detection of erythrogenic toxins A and C) will help to improve molecular-epidemiologic surveillance for streptococcal group A infection, development of recommendations on reduction of morbidity from this infection and also to decrease risk of its severe forms, complications and mortality.