Milagrosa Montes1, Esther Tamayo2, Catalina Mojica3, José M García-Arenzana3, Olatz Esnal2, Emilio Pérez-Trallero4. 1. Microbiology Department, Hospital Universitario Donostia-Instituto Biodonostia, San Sebastián, Spain Biomedical Research Centre Network for Respiratory Diseases (CIBERES), San Sebastián, Spain. 2. Biomedical Research Centre Network for Respiratory Diseases (CIBERES), San Sebastián, Spain. 3. Microbiology Department, Hospital Universitario Donostia-Instituto Biodonostia, San Sebastián, Spain. 4. Microbiology Department, Hospital Universitario Donostia-Instituto Biodonostia, San Sebastián, Spain Biomedical Research Centre Network for Respiratory Diseases (CIBERES), San Sebastián, Spain Faculty of Medicine, University of the Basque Country, UPV/EHU, San Sebastián, Spain mikrobiol@terra.com.
Abstract
OBJECTIVES: To survey antibiotic resistance among Streptococcus pyogenes isolates collected from 2005 to 2012, to characterize those showing erythromycin resistance and to analyse the association of certain emm types with erythromycin resistance or susceptibility. METHODS: Resistance determinants or mutations conferring erythromycin, clindamycin, tetracycline and fluoroquinolone resistance were analysed. All erythromycin-resistant isolates and a sample of erythromycin-susceptible isolates were emm typed. Multilocus sequence typing was performed for representative emm types. RESULTS: Antimicrobial susceptibility was studied for 12 346 S. pyogenes isolates. Erythromycin, clindamycin and tetracycline resistance showed a decreasing trend. In 2012, 2.8% of isolates were erythromycin resistant versus 7.5% in 2005 and 11.7% in 2006. Although 21 clones were involved, 4 clones accounted for almost 90% of erythromycin-resistant isolates. The emm12/ST36 clone, carrying the mef(A) gene, was the predominant (41.1%) erythromycin-resistant clone, with an incidence peak in 2008, followed by a gradual decline. The M phenotype predominated each year except for 2005, when two of the main erythromycin-resistant clones (emm11/ST403 and emm28/ST52) harboured an erm(B) gene. Erythromycin resistance was significantly higher in adults than in children. Skin isolates showed the highest erythromycin resistance rate; among these, perianal isolates frequently belonged to the emm28/ST52 clone. The emm type was not a predictor of erythromycin resistance; however, most emm11 and emm12 were erythromycin-resistant isolates. Macrolide consumption was similar throughout the study period. Only two isolates with a high level of levofloxacin resistance were detected. CONCLUSIONS: Resistance was mainly related to the circulation of emm12/ST36, emm11/ST403, emm28/ST52 and emm4/ST39 clones, all of which declined throughout the study period.
OBJECTIVES: To survey antibiotic resistance among Streptococcus pyogenes isolates collected from 2005 to 2012, to characterize those showing erythromycin resistance and to analyse the association of certain emm types with erythromycin resistance or susceptibility. METHODS: Resistance determinants or mutations conferring erythromycin, clindamycin, tetracycline and fluoroquinolone resistance were analysed. All erythromycin-resistant isolates and a sample of erythromycin-susceptible isolates were emm typed. Multilocus sequence typing was performed for representative emm types. RESULTS: Antimicrobial susceptibility was studied for 12 346 S. pyogenes isolates. Erythromycin, clindamycin and tetracycline resistance showed a decreasing trend. In 2012, 2.8% of isolates were erythromycin resistant versus 7.5% in 2005 and 11.7% in 2006. Although 21 clones were involved, 4 clones accounted for almost 90% of erythromycin-resistant isolates. The emm12/ST36 clone, carrying the mef(A) gene, was the predominant (41.1%) erythromycin-resistant clone, with an incidence peak in 2008, followed by a gradual decline. The M phenotype predominated each year except for 2005, when two of the main erythromycin-resistant clones (emm11/ST403 and emm28/ST52) harboured an erm(B) gene. Erythromycin resistance was significantly higher in adults than in children. Skin isolates showed the highest erythromycin resistance rate; among these, perianal isolates frequently belonged to the emm28/ST52 clone. The emm type was not a predictor of erythromycin resistance; however, most emm11 and emm12 were erythromycin-resistant isolates. Macrolide consumption was similar throughout the study period. Only two isolates with a high level of levofloxacin resistance were detected. CONCLUSIONS: Resistance was mainly related to the circulation of emm12/ST36, emm11/ST403, emm28/ST52 and emm4/ST39 clones, all of which declined throughout the study period.
Authors: Sanjana Mukherjee; Heather M Blankenship; Jose A Rodrigues; Rebekah E Mosci; James T Rudrik; Shannon D Manning Journal: Antimicrob Agents Chemother Date: 2021-08-23 Impact factor: 5.191
Authors: G Gherardi; D Petrelli; M C Di Luca; F Pimentel de Araujo; P Bernaschi; A Repetto; J Bellesi; L A Vitali Journal: Eur J Clin Microbiol Infect Dis Date: 2015-05-30 Impact factor: 3.267