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BMC Infectious Diseases
Published in: BMC Infectious Diseases 1/2020

01-12-2020 | Streptococci | Research article

Molecular epidemiology and antimicrobial resistance of group a streptococcus recovered from patients in Beijing, China

Authors: Hongxin Li, Lin Zhou, Yong Zhao, Lijuan Ma, Xiaoyan Liu, Jin Hu

Published in: BMC Infectious Diseases | Issue 1/2020

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Abstract

Background

Group A streptococcus (GAS) is an important human pathogen responsible for a broad range of infections. Epidemiological surveillance has been crucial to detect changes in the geographical and temporal variation of the disease pattern. The objective of this study was to investigate the molecular epidemiological characteristics and antimicrobial resistance of GAS isolates from patients in Children’s Hospital in Beijing.

Methods

From 2016 to 2017, pharyngeal swab samples were collected from the outpatients in Children’s Hospital, Capital Institute of Pediatrics, who were diagnosed with scarlet fever. Antimicrobial susceptibility test was performed according to the distribution of conventional antibiotics and Clinical and Laboratory Standards Institute (CLSI) recommendations. The distribution of the macrolide-resistance genes (ermB, ermA, mefA), emm (M protein-coding gene) typing, and superantigens (SAg) gene profiling were examined by polymerase chain reaction (PCR).

Results

A total of 297 GAS isolates were collected. The susceptibility of the isolates to penicillin, ceftriaxone, and levofloxacin was 100%. The resistance rate to erythromycin and clindamycin was 98.3 and 96.6%, respectively. The dominant emm types were emm12 (65.32%), emm1 (27.61%), emm75 (2.69%), and emm89 (1.35%). Of the 297 isolates, 290 (97.64%) carried the ermB gene, and 5 (1.68%) carried the mefA gene, while none carried the ermA gene. The most common superantigen genes identified from GAS isolates were smeZ (96.97%), speC (92.59%), speG (91.58%), ssa (85.52%), speI (54.55%), speH (52.19%), and speA (34.34%). Isolates with the genotype emm1 possessed speA, speC, speG, speJ, speM, ssa, and smeZ, while emm12 possessed speC, speG, speH, speI, speM, ssa, and smeZ superantigens.

Conclusions

The prevalent strain of GAS isolates in Beijing has a high resistance rate to macrolides; however, penicillin can still be the preferred antibiotic for treatment. Erythromycin resistance was predominantly mediated by ermB. The common emm types were emm12 and emm1. There was a correlation between emm and the superantigen gene. Thus, long-term monitoring and investigation of the emm types and superantigen genes of GAS prevalence are imperative.
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Metadata
Title
Molecular epidemiology and antimicrobial resistance of group a streptococcus recovered from patients in Beijing, China
Authors
Hongxin Li
Lin Zhou
Yong Zhao
Lijuan Ma
Xiaoyan Liu
Jin Hu
Publication date
01-12-2020
Publisher
BioMed Central
Published in
BMC Infectious Diseases / Issue 1/2020
Electronic ISSN: 1471-2334
DOI
https://doi.org/10.1186/s12879-020-05241-x

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