title: Streptococcus pyogenes emm Types and Clusters during a 7-Year Period (2007 to 2013) in Pharyngeal and Nonpharyngeal Pediatric Isolates.
abstract: Group A streptococcus (GAS) is an important cause of morbidity and mortality worldwide. Surveillance of emm types has important implications, as it can provide baseline information for possible implementation of vaccination. A total of 1,349 GAS pediatric isolates were collected during a 7-year period (2007 to 2013); emm typing was completed for 1,282 pharyngeal (84%) or nonpharyngeal (16%) isolates, and emm clusters and temporal changes were analyzed. Thirty-five different emm types, including 14 subtypes, were identified. The most prevalent emm types identified were 1 (16.7%), 12 (13.6%), 77 (10.9%), 4 (10.8%), 28 (10.4%), 6 (6.8%), 3 (6.6%), and 89 (6.6%), accounting for 82.3% of total isolates. Rheumatogenic emm types comprised 16.3% of total isolates. The emm types 12, 4, and 77 were more prevalent among pharyngeal isolates, and the emm types 1, 89, 6, 75, and 11 were more prevalent among nonpharyngeal isolates. The emm types identified belonged to 13 emm clusters, and the 8 most prevalent clusters comprised 97% of all isolates. There were statistically significant decreases in the prevalence of emm types 12, 4, 5, and 61 and increases in the prevalence of emm types 89, 75, and 11, compared with the period 2001 to 2006. The proposed 30-valent GAS vaccine, which is currently in preclinical studies, encompasses 97.2% of the emm types detected in our study and 97.4% of the erythromycin-resistant strains. In addition, it includes 93.3% of the emm types involved in bacteremia. A much greater diversity of GAS emm types was identified in our area than described previously. Seasonal fluctuations and the introduction of new emm types were observed. Continuous surveillance of emm types is needed in order to evaluate the possible benefits of an M protein-based GAS vaccine.
authors: First Department of Pediatrics, University of Athens, Division of Infectious Diseases, Aghia Sophia Children's Hospital, Athens, Greece.
authors: F
authors: F
authors: Koutouzi
authors: Department of Microbiology, Medical School, University of Athens, Athens, Greece.
authors: A
authors: A
authors: Tsakris
authors: First Department of Pediatrics, University of Athens, Division of Infectious Diseases, Aghia Sophia Children's Hospital, Athens, Greece.
authors: P
authors: P
authors: Chatzichristou
authors: First Department of Pediatrics, University of Athens, Division of Infectious Diseases, Aghia Sophia Children's Hospital, Athens, Greece.
authors: E
authors: E
authors: Koutouzis
authors: First Department of Propaedeutic Medicine, University of Athens, Athens, Greece.
authors: G L
authors: GL
authors: Daikos
authors: Department of Microbiology, Aghia Sophia Children's Hospital, Athens, Greece.
authors: E
authors: E
authors: Kirikou
authors: Department of Microbiology, Aghia Sophia Children's Hospital, Athens, Greece.
authors: N
authors: N
authors: Petropoulou
authors: First Department of Pediatrics, University of Athens, Division of Infectious Diseases, Aghia Sophia Children's Hospital, Athens, Greece.
authors: V
authors: V
authors: Syriopoulou
authors: First Department of Pediatrics, University of Athens, Division of Infectious Diseases, Aghia Sophia Children's Hospital, Athens, Greece amichos@med.uoa.gr.
authors: A
authors: http://orcid.org/0000-0003-1745-1118
authors: A
authors: Michos
mesh_terms: D000942:Antigens, Bacterial / Q000235:genetics*; D001425:Bacterial Outer Membrane Proteins / Q000235:genetics*; D002352:Carrier Proteins / Q000235:genetics*; D002648:Child; D002675:Child, Preschool; D016000:Cluster Analysis; D005260:Female; D005838:Genotype; D006801:Humans; D008297:Male; D017720:Molecular Epidemiology; D058889:Molecular Typing; D011446:Prospective Studies; D013290:Streptococcal Infections / Q000382:microbiology*; D013297:Streptococcus pyogenes / Q000145:classification* / Q000235:genetics* / Q000302:isolation & purification
chemical_list: D000942:Antigens, Bacterial; D001425:Bacterial Outer Membrane Proteins; D002352:Carrier Proteins; C014689:streptococcal M protein