title: emm Typing of group A streptococcus clinical isolates: identification of dominant types for throat and skin isolates.
abstract: T and emm types were determined for group A streptococci isolated from patients with various infections during 1990-1999 in Toyama Prefecture, Japan. Out of 906 isolates, 872 isolates were divided into 20 T serotypes, and 34 isoltes were T nontypeable (TNT). T12, T1, and T4 were dominant among 699 throat isolates; on the other hand, T11, T28, TB3264, and TNT were dominant among 80 skin isolates. The emm types of 190 isolates were determined following specific PCR amplification and sequencing of the products. Twenty T serotypes were divided into 34 T type/emm type combinations. Thirty-four TNT isolates were divided into 14 emm types, in which emm58 was the most common (38%). Among 82 throat isolates randomly selected, predominant T types T12, T1, and T4 isolates were of the respective same numbers in emm type. T11/emm89, T28/emm28, TB3264/emm13w, and TNT/emm58 were predominant among 80 skin isolates. emm-type distribution observed in the present study was that usually reported in the western world. To our knowledge, 3 T/emm is a novel combination. These results show that emm typing allows the characterization of group A streptococci from various sources.
authors.affiliation: Department of Bacteriology, Toyama Institute of Health, Kosugi, Japan. daisuke.tanaka@pref.toyama.jp
authors.forename: Daisuke
authors.initials: D
authors.lastname: Tanaka
authors.forename: Yotaku
authors.initials: Y
authors.lastname: Gyobu
authors.forename: Hirohide
authors.initials: H
authors.lastname: Kodama
authors.forename: Junko
authors.initials: J
authors.lastname: Isobe
authors.forename: Shiho
authors.initials: S
authors.lastname: Hosorogi
authors.forename: Yuko
authors.initials: Y
authors.lastname: Hiramoto
authors.forename: Tadahiro
authors.initials: T
authors.lastname: Karasawa
authors.forename: Shinichi
authors.initials: S
authors.lastname: Nakamura
mesh_terms: D000942:Antigens, Bacterial; D001425:Bacterial Outer Membrane Proteins / Q000032:analysis / Q000145:classification / Q000235:genetics*; D015373:Bacterial Typing Techniques; D002352:Carrier Proteins / Q000032:analysis / Q000145:classification / Q000235:genetics*; D005799:Genes, Dominant; D006801:Humans; D010614:Pharynx / Q000276:immunology / Q000382:microbiology*; D012703:Serotyping; D012867:Skin / Q000276:immunology / Q000382:microbiology*; D013290:Streptococcal Infections / Q000382:microbiology* / Q000473:pathology; D013297:Streptococcus pyogenes / Q000145:classification* / Q000235:genetics / Q000276:immunology / Q000302:isolation & purification
chemical_list: D000942:Antigens, Bacterial; D001425:Bacterial Outer Membrane Proteins; D002352:Carrier Proteins; C014689:streptococcal M protein