title: Array of M protein gene subtypes in 1064 recent invasive group A streptococcus isolates recovered from the active bacterial core surveillance.
abstract: Using sequence analysis to detect variation within the hypervariable M protein N terminus, we found 41 emm types encompassing 81 subtypes, among 1064 consecutive invasive group A streptococcus isolates from a recent multistate, population-based surveillance. Seventeen of the 30 emm types represented by multiple isolates displayed multiple subtypes. Most subtypes differed from reference strain emm sequences as a result of single base substitutions or other alterations likely to be stably inherited. The Centers for Disease Control and Prevention database (available at: http://www.cdc.gov/ncidod/biotech/strep/strepblast.htm) currently contains 225 distinct emm types encompassing 450 subtypes. Although this subtyping scheme increases specificity, limited variation within individual types favors introduction of M protein type-specific vaccines.
authors: Division of Bacterial and Mycotic Diseases, Respiratory Diseases Branch, Centers for Disease Control and Prevention, Atlanta, Georgia 30333, USA.
authors: Zhongya
authors: Z
authors: Li
authors: Varja
authors: V
authors: Sakota
authors: Delois
authors: D
authors: Jackson
authors: Alma Ruth
authors: AR
authors: Franklin
authors: Bernard
authors: B
authors: Beall
mesh_terms: D000595:Amino Acid Sequence; D000942:Antigens, Bacterial; D001425:Bacterial Outer Membrane Proteins / Q000737:chemistry / Q000235:genetics* / Q000302:isolation & purification; D001483:Base Sequence; D002352:Carrier Proteins / Q000737:chemistry / Q000235:genetics* / Q000302:isolation & purification; D002487:Centers for Disease Control and Prevention, U.S.; D004269:DNA, Bacterial / Q000737:chemistry / Q000235:genetics; D014644:Genetic Variation; D006801:Humans; D008969:Molecular Sequence Data; D016415:Sequence Alignment; D013290:Streptococcal Infections / Q000276:immunology* / Q000382:microbiology / Q000517:prevention & control; D022541:Streptococcal Vaccines / Q000235:genetics / Q000276:immunology; D013291:Streptococcus / Q000145:classification / Q000235:genetics* / Q000276:immunology / Q000302:isolation & purification; D014481:United States
chemical_list: D000942:Antigens, Bacterial; D001425:Bacterial Outer Membrane Proteins; D002352:Carrier Proteins; D004269:DNA, Bacterial; D022541:Streptococcal Vaccines; C014689:streptococcal M protein