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Title: Factors associated with Group A Streptococcus emm type diversification in a large urban setting in Brazil: a cross-sectional study.
Authors: Tartof, Sara Yee
Reis, Joice Neves
Andrade, Aurelio Nei
Ramos, Regina Terse Trindade
Reis, Mitermayer Galvão dos
Riley, Lee Woodland
Affilliation: University of California Berkeley. School of Public Health. USA.
Universidade Federal da Bahia. Faculdade de Farmácia. Salvador, BA, Brasil
Hospital São Rafael-Monte Tabor. Salvador, BA, Brasil
Federal University of Bahia School of Medicine. Department of Pediatrics. Salvador, BA, Brasil.
Fundação Oswaldo Cruz. Centro de Pesquisa Gonçalo Moniz. Salvador, BA, Brasil
University of California Berkeley. School of Public Health. USA.
Abstract: Group A Streptococcus (GAS) strain diversity varies across different regions of the world, according to low versus high-income countries. These differences may be related to geographic, environmental, socioeconomic, or host-related factors. However, local factors may also affect strain diversity. We compared the emm types of GAS isolates from children with and without sore throat in one large urban setting in Brazil. METHODS: Children 3-15 years of age were consecutively recruited from slum and non-slum pediatric outpatient clinics between April-October, 2008. Throat cultures were performed and data intake forms were completed. GAS isolates were typed by emm sequencing. RESULTS: From 2194 children, 254 (12%) GAS isolates were obtained. Of 238 GAS isolates that were emm-typed, 61 unique emm types were identified. Simpson's diversity index of the emm types was higher among isolates from slum children [97% (96%-98%)] than those of non-slum children [92% (89%-96%)]. Two emm types (66.0, 12.0) were more frequently isolated from children with sore throat (p < 0.05), and one emm type (27G.0) demonstrated a protective effect. CONCLUSIONS: The emm type diversity from children attending slum clinics resembled the emm diversity of low income countries rather than that of children attending a non-slum clinic in the same city. Local factors, such as crowding, may enhance the frequency of GAS transmission and horizontal gene transfers that contribute to increased strain diversity in the slums. GAS vaccine coverage and control of GAS infections will need to take these local factors and strain differences into consideration.
DeCS: Variação Genética
Infecções Estreptocócicas/epidemiologia
Streptococcus pyogenes/genética
Técnicas de Tipagem Bacteriana
Estudos Transversais
Áreas de Pobreza
Infecções Estreptocócicas/microbiologia
Streptococcus pyogenes/classificação
Streptococcus pyogenes/isolamento & purificação
População Urbana
Issue Date: 2010
Publisher: BioMed Central
Citation: TARTOF, S. Y. et al. Factors associated with Group A Streptococcus emm type diversification in a large urban setting in Brazil: a cross-sectional study. BMC Infectious Diseases, v. 10, p. 327, 2010.
ISSN: 1471-2334
Copyright: open access
Appears in Collections:BA - IGM - Artigos de Periódicos

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