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Prevalent emm Types among Invasive GAS in Europe and North America since Year 2000.

ABSTRACT: Background:Streptococcus pyogenes or group A streptococcus (GAS) is an important human pathogen responsible for a broad range of infections, from uncomplicated to more severe and invasive diseases with high mortality and morbidity. Epidemiological surveillance has been crucial to detect changes in the geographical and temporal variation of the disease pattern; for this purpose the M protein gene (emm) gene typing is the most widely used genotyping method, with more than 200 emm types recognized. Molecular epidemiological data have been also used for the development of GAS M protein-based vaccines. Methods:The aim of this paper was to provide an updated scenario of the most prevalent GAS emm types responsible for invasive infections in developed countries as Europe and North America (US and Canada), from 1st January 2000 to 31st May 2017. The search, performed in PubMed by the combined use of the terms ("emm") and ("invasive") retrieved 264 articles, of which 38 articles (31 from Europe and 7 from North America) met the inclusion criteria and were selected for this study. Additional five papers cited in the European articles but not retrieved by the search were included. Results:emm1 represented the dominant type in both Europe and North America, replaced by other emm types in only few occasions. The seven major emm types identified (emm1, emm28, emm89, emm3, emm12, emm4, and emm6) accounted for approximately 50-70% of the total isolates; less common emm types accounted for the remaining 30-50% of the cases. Most of the common emm types are included in either one or both the 26-valent and 30-valent vaccines, though some well-represented emm types found in Europe are not. Conclusion:This study provided a picture of the prevalent emm types among invasive GAS (iGAS) in Europe and North America since the year 2000 onward. Continuous surveillance on the emm-type distribution among iGAS infections is strongly encouraged also to determine the potential coverage of the developing multivalent vaccines.

SUBMITTER: Gherardi G

PROVIDER: S-EPMC5890186 | biostudies-literature | 2018

REPOSITORIES: biostudies-literature

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Prevalent <i>emm</i> Types among Invasive GAS in Europe and North America since Year 2000.

Gherardi Giovanni G Vitali Luca Agostino LA Creti Roberta R

Frontiers in public health 20180309

<h4>Background</h4><i>Streptococcus pyogenes</i> or group A streptococcus (GAS) is an important human pathogen responsible for a broad range of infections, from uncomplicated to more severe and invasive diseases with high mortality and morbidity. Epidemiological surveillance has been crucial to detect changes in the geographical and temporal variation of the disease pattern; for this purpose the M protein gene (<i>emm)</i> gene typing is the most widely used genotyping method, with more than 200 ...[more]

PMID: 29662874

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Project description:The discovery of Helicobacter hepaticus and its role in hepatitis, hepatocellular carcinoma, typhlocolitis, and lower-bowel carcinoma in murine colonies was followed by the isolation and characterization of other Helicobacter spp. involved in enterohepatic disease. Colonization of mouse colonies with members of the family Helicobacteriaceae has become an increasing concern for the research community. From 2001 to 2005, shipments of selected gift mice from other institutions and mice received from specified commercial vendors were screened for Helicobacter spp. by culture of cecal tissue. The identities of the isolates were confirmed by genus-specific PCR, followed by species-specific PCR and restriction fragment length polymorphism analysis. Sequencing of the 16S rRNA gene was performed if the species identity was not apparent. The survey included 79 mice from 34 sources: 2 commercial sources and 16 research sources from the United States and 1 commercial source and 15 research sources from Canada, Europe, or Asia. Helicobacter spp. were cultured from the ceca of 62 of 79 mice. No Helicobacter spp. were found in mice from advertised Helicobacter-free production areas from two U.S. vendors. Multiple Helicobacter spp. were found in mice from one vendor's acknowledged Helicobacter-infected production area. The European commercial vendor had mice infected with novel Helicobacter sp. strain MIT 96-1001. Of the U.S. academic institutions, 6 of 16 (37%) had mice infected with Helicobacter hepaticus; but monoinfection with H. bilis, H. mastomyrinus, H. rodentium, and MIT 96-1001 was also encountered, as were mice infected simultaneously with two Helicobacter spp. Non-U.S. academic institutions had mice that were either monoinfected with H. hepaticus, monoinfected with seven other Helicobacter spp., or infected with a combination of Helicobacter spp. This survey indicates that 30 of 34 (88%) commercial and academic institutions in Canada, Europe, Asia, Australia, and the United States have mouse colonies infected with Helicobacter spp. Mice from 20 of the 34 institutions (59%) were most commonly colonized with H. hepaticus alone or in combination with other Helicobacter spp. These results indicate that a broad range of Helicobacter spp. infect mouse research colonies. The potential impact of these organisms on in vivo experiments continues to be an important issue for mice being used for biomedical research.

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Prevalent emm Types among Invasive GAS in Europe and North America since Year 2000.

Publications

Prevalent <i>emm</i> Types among Invasive GAS in Europe and North America since Year 2000.

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