title: Survey of emm gene sequences and T-antigen types from systemic Streptococcus pyogenes infection isolates collected in San Francisco, California; Atlanta, Georgia; and Connecticut in 1994 and 1995.
abstract: The variable 5' emm (M-protein gene) sequences and T-antigen types were determined from 340 systemic group A streptococcal (GAS) isolates taken from hospitalized patients in San Francisco, Calif.; Atlanta, Ga.; and Connecticut in 1994 and 1995. Eighty percent of these isolates had emm sequences and T-antigen types in agreement with previously recorded M- and T-antigen associations. Most of the remaining strains either were T nontypeable (11%) or contained emm genes encoding M proteins for which T-antigen associations have not been made (6%). One newly encountered emm gene, designated ST2974, from each of 13 isolates had the T type 8/25/Imp19. Another new emm gene, ST2967, from 8 of 11 isolates was T nontypeable. Six other unique emm gene sequences from seven isolates were encountered. Sequencing of the variable region of the emm gene of GAS isolates (emm typing) is effective for surveying the sequence variability of the M virulence protein, and combined with T typing, emm typing is useful for monitoring GAS strain diversity.
authors.affiliation: Childhood and Respiratory Diseases Branch, Centers for Diseases Control and Prevention, Atlanta, Georgia 30333, USA. beb0@ciddbd2.em.cdc.gov
authors.forename: B
authors.initials: B
authors.lastname: Beall
authors.forename: R
authors.initials: R
authors.lastname: Facklam
authors.forename: T
authors.initials: T
authors.lastname: Hoenes
authors.forename: B
authors.initials: B
authors.lastname: Schwartz
mesh_terms: D000595:Amino Acid Sequence; D000942:Antigens, Bacterial; D000957:Antigens, Viral, Tumor / Q000235:genetics / Q000276:immunology*; D001425:Bacterial Outer Membrane Proteins; D001426:Bacterial Proteins / Q000235:genetics*; D002352:Carrier Proteins; D003237:Connecticut; D005798:Genes, Bacterial; D005845:Georgia; D006801:Humans; D008969:Molecular Sequence Data; D012495:San Francisco; D016415:Sequence Alignment; D013290:Streptococcal Infections / Q000453:epidemiology / Q000382:microbiology*; D013297:Streptococcus pyogenes / Q000235:genetics* / Q000276:immunology / Q000302:isolation & purification
chemical_list: D000942:Antigens, Bacterial; D000957:Antigens, Viral, Tumor; D001425:Bacterial Outer Membrane Proteins; D001426:Bacterial Proteins; D002352:Carrier Proteins; C014689:streptococcal M protein