Objectives: Our aim was to study the macrolide resistance mechanisms and antimicrobial susceptibilities of viridans group streptococci (VGS) isolated from blood cultures.
Methods: In vitro susceptibilities to nine antimicrobials were studied for 85 VGS isolated from blood cultures by agar dilution. Pheno- and genotyping of erythromycin-resistant isolates were studied by the double disc test and PCR.
Results: Resistance to erythromycin was found in 27% (n = 23) of the isolates. Erythromycin-resistant Streptococcus oralis (n = 13) predominated among the other erythromycin-resistant species isolated. The phenotypes among 23 erythromycin-resistant isolates were as follows: 12 constitutive macrolide-lincosamide-streptogramin (cMLS(B)) resistance phenotype and 11 macrolide (M) resistance phenotype. Of the cMLS(B) isolates 11 had erm(B) genes and 11 of the M phenotype isolates had mef(A) genes. Four of the cMLS(B) isolates had both erm(B) and mef(A) genes. None of the isolates had erm(TR) genes. Combined resistance to erythromycin with penicillin, clindamycin, chloramphenicol, tetracycline and quinupristin/dalfopristin was found in 100, 61, 74, 100 and 100% of the isolates, respectively. No resistance was found for vancomycin, linezolid and levofloxacin.
Conclusions: The macrolide resistance mechanisms of our VGS isolates revealed that the cMLS(B) phenotype associated with erm(B) and the M phenotype associated with mef(A) genes are found with similar frequencies.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1093/jac/dki404 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Epidemiological and clinical characteristics of hospitalized pediatric patients with Mycoplasma pneumoniae pneumonia before and after the COVID-19 pandemic in China: a retrospective multicenter study.
BMC Infect Dis
January 2025
Department of Emergency Medicine, Affiliated Hospital of Jiangsu University, Zhenjiang, Jiangsu, 212001, China.
Background: In China many respiratory pathogens stayed low activities amid the COVID-19 pandemic due to strict measures and controls. We here aimed to study the epidemiological and clinical characteristics of pediatric inpatients with Mycoplasma pneumoniae pneumonia (MPP) after the mandatory COVID-19 restrictions were lifted, in comparison to those before the COVID-19 pandemic.
Methods: We here included 4,296 pediatric patients with MPP, hospitalized by two medical centers in Jiangsu Province, China, from January 2015 to March 2024.
Progress in antileishmanial drugs: Mechanisms, challenges, and prospects.
PLoS Negl Trop Dis
January 2025
Department of Pathogen Biology, School of Basic Medicine, Tongji Medical College and State Key Laboratory for Diagnosis and Treatment of Severe Zoonotic Infectious Diseases, Huazhong University of Science and Technology, Wuhan, China.
Leishmaniasis, a neglected tropical disease caused by Leishmania parasites, continues to pose global health challenges. Current treatments face issues like resistance, safety, efficacy, and cost. This review covers the discovery, mechanisms of action, clinical applications, and limitations of key antileishmanial agents: pentavalent antimonials, amphotericin B, miltefosine, paromomycin, and pentamidine.
View Article and Find Full Text PDFComputational and GC-MS screening of bioactive compounds from Thymus Vulgaris targeting mycolactone protein associated with Buruli ulcer.
Sci Rep
January 2025
Department of Pharmacology and Toxicology, College of Pharmacy, King Saud University, P.O. Box 2455, Riyadh, 11451, Saudi Arabia.
Buruli ulcer (BU) a neglected disease induced by the bacterium Mycobacterium ulcerans, predominantly impacts tropical and subtropical areas with its pathophysiology ascribed to the Mycolactone protein. Current antibiotics frequently prove insufficient to manage advanced or chronic ulcers and the rise of drug resistance presents a considerable challenge. This work aims to address these challenges by employing computational methods to identify therapeutic candidates from organic compounds, which may be developed into more effective therapies for Buruli ulcer.
View Article and Find Full Text PDFIncreasing rates of (B) and (N) in human and erythromycin-resistant isolates between 2018 and 2023 in France.
Antimicrob Agents Chemother
December 2024
National Reference Centre for Campylobacters & Helicobacters, Bordeaux, France.
Macrolides are the first-line compounds used for the treatment of campylobacteriosis. Macrolide resistance remains low in France, with mutations in being the main associated resistance mechanism. However, two erythromycin methyltransferases have also been identified(B), which is mainly described in animal reservoirs, and (N), which is strictly described in humans.
View Article and Find Full Text PDF[Examination of Capsule Genotypes, Antibiotic Susceptibility Profiles and Biofilm Forming Abilities of Group B Streptococcus Isolates Isolated from Pregnant Women].
Mikrobiyol Bul
October 2024
Çukurova University Faculty of Medicine, Department of Medical Microbiology, Adana, Türkiye.
Group B Streptococcus (GBS) or Streptococcus agalactiae is a pathogen that causes infections during pregnancy. The aim of this study was to investigate the antibiotic sensitivity profiles, capsule genotypes and biofilm forming capabilities of GBS isolates obtained from pregnant women . The study included 252 pregnant women who applied to Adana Gynecology and Children's Hospital between 2018 and 2023.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!