Dataset Information

Full Sequencing and Genomic Analysis of Three emm75 Group A Streptococcus Strains Recovered in the Course of an Epidemiological Shift in French Brittany.

ABSTRACT: While the incidence and invasiveness of type emm75 group A Streptococcus (GAS) infections increased in French Brittany during 2013, we sequenced and analyzed the genomes of three independent strains isolated in 2009, 2012, and 2014, respectively. In this short-term evolution, genomic analysis evidenced mainly the integration of new phages encoding virulence factors.

SUBMITTER: Rochefort A

PROVIDER: S-EPMC5624753 | biostudies-literature | 2017 Sep

REPOSITORIES: biostudies-literature

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Publications

Full Sequencing and Genomic Analysis of Three emm75 Group A Streptococcus Strains Recovered in the Course of an Epidemiological Shift in French Brittany.

Rochefort Aude A Boukthir Sarrah S Moullec Séverine S Meygret Alexandra A Adnani Yahia Y Lavenier Dominique D Faili Ahmad A Kayal Samer S

Genome announcements 20170928 39

While the incidence and invasiveness of type emm75 group A Streptococcus (GAS) infections increased in French Brittany during 2013, we sequenced and analyzed the genomes of three independent strains isolated in 2009, 2012, and 2014, respectively. In this short-term evolution, genomic analysis evidenced mainly the integration of new phages encoding virulence factors. ...[more]

PMID: 28963207

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Project description:Streptococcus pyogenes or group A Streptococcus (GAS) causes diseases ranging from uncomplicated pharyngitis to life-threatening infections. It has complex epidemiology driven by the diversity, the temporal and geographical fluctuations of the circulating strains. Despite the global burden of GAS diseases, there is currently no available vaccination strategy against GAS infections. This study, based on a longitudinal population survey, aimed to understand the dynamic of GAS emm types and to give leads to better recognition of underlying mechanisms for the emergence of successful clones. From 2009 to 2017, we conducted a systematic culture-based diagnosis of GAS infections in a French Brittany population with a prospective recovery of clinical data. The epidemiological analysis was performed using emm typing combined with the structural and functional cluster-typing system for all the recovered strains. Risk factors for the invasiveness, identified by univariate analysis, were computed in a multiple logistic regression analysis, and the only independent risk factor remaining in the model was the age (OR for the entire range [CI95%] = 6.35 [3.63, 11.10]; p<0.0001). Among the 61 different emm types identified, the most prevalent were emm28 (16%), emm89 (15%), emm1 (14%), and emm4 (8%), which accounted for more than 50% of circulating strains. During the study period, five genotypes identified as emm44, 66, 75, 83, 87 emerged successively and belonged to clusters D4, E2, E3, and E6 that were different from those gathering "Prevalent" emm types (clusters A-C3 to 5, E1 and E4). We previously reported significant genetic modifications for emm44, 66, 83 and 75 types resulting possibly from a short adaptive evolution. Herein we additionally observed that the emergence of a new genotype could occur in a susceptible population having specific risk factors or probably lacking a naturally-acquired cluster-specific immune cross-protection. Among emergent emm types, emm75 and emm87 tend to become prevalent with a stable annual incidence and the risk of a clonal expansion have to be considered.

Dataset Information

Full Sequencing and Genomic Analysis of Three emm75 Group A Streptococcus Strains Recovered in the Course of an Epidemiological Shift in French Brittany.

Publications

Full Sequencing and Genomic Analysis of Three <i>emm</i>75 Group A <i>Streptococcus</i> Strains Recovered in the Course of an Epidemiological Shift in French Brittany.

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