Unexpected relationships between frequency of antimicrobial resistance, disease phenotype and emm type in group A Streptococcus
| Autor: | Misu A. Sanson, Luis Vega, Zain I. Alamarat, Olga R. Macias, Anthony R. Flores, Brittany J. Shah, Blake Hanson |
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| Rok vydání: | 2019 |
| Předmět: |
Genotype
Streptococcus pyogenes Tetracycline Erythromycin Microbial Sensitivity Tests Biology medicine.disease_cause Microbiology 03 medical and health sciences Microbial evolution and epidemiology: Communicable disease genomics Plasmid Antibiotic resistance Streptococcal Infections Drug Resistance Bacterial medicine antimicrobial resistance Phylogeny Prophage 030304 developmental biology 0303 health sciences 030306 microbiology Streptococcus group A Streptococcus pharyngitis General Medicine Antimicrobial Anti-Bacterial Agents 3. Good health Phenotype emm type skin and soft tissue Mobile genetic elements invasive Research Article Bacterial Outer Membrane Proteins medicine.drug |
| Zdroj: | Microbial Genomics |
| ISSN: | 2057-5858 |
| DOI: | 10.1099/mgen.0.000316 |
| Popis: | Despite universal susceptibility to β-lactams, resistance to second-line antimicrobials (e.g. erythromycin) is increasingly common among group A Streptococcus (GAS). To better understand the frequency of regional GAS antimicrobial resistance, we screened a previously described GAS strain collection from Houston, TX, USA, for resistance to commonly used antimicrobials. A total of 100/929 (10.8 %) showed resistance to at least one antimicrobial. Tetracycline resistance was identified in 52 (5.6 %) GAS strains. The cumulative frequency of erythromycin and clindamycin resistance [macrolide (M) and macrolide-lincosamide-streptogramin (MLS) phenotypes] was greatest among invasive GAS strains (9.9 %) compared to that of strains derived from any other infection type (5.9 %, P=0.045). We identified emm types 11, 75, 77 and 92 as the only emm types with high (e.g. >50 %) within-emm type resistance and contributing to the majority (24/26; 92 %) of erythromycin/clindamycin resistance in invasive GAS. High-frequency resistance emm types were also significantly overrepresented in invasive GAS strains as indicated by invasive index. We performed whole-genome sequencing to define genetic elements associated with resistance among emm types 11, 75, 77 and 92. Diverse mobile elements contributed to GAS resistance including transposons, integrative conjugative elements, prophage and a plasmid. Phylogenetic analysis suggests recent clonal emergence of emm92 GAS strains. Our findings indicate that less frequently encountered GAS emm types disproportionately contribute to resistance phenotypes, are defined by diverse mobile genetic elements and may favour invasive disease. |
| Databáze: | OpenAIRE |
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