Related Experiment Video
Updated: Aug 11, 2026

Biosensor for Detection of Antibiotic Resistant Staphylococcus Bacteria
Published on: May 8, 2013
[Antimicrobial resistance characteristics of clinical isolates of Streptococcus pyogenes]
R S Rodríguez1, E Calderón-Jaimes, D Gómez-Barreto
1Departamento de Infectología, Hospital Infantil de México Federico Gómez, México, D.F., México. hospdirg@prodigy.net.mx
Objective:
To determine the antibiotic susceptibility of recent isolates of Streptococcus pyogenes and to evaluate the prevalence of macrolide-resistant phenotypes.
Material And Methods:
In 1999, we conducted a cross-sectional study at Mexico Children's Hospital "Federico Gomez", to analyze one hundred strains of S. pyogenes isolated from 1992 to 1998, in children with uncomplicated pharyngotonsillitis. Strains were frozen at the bacteriology lab until they were analyzed. Strains were tested for susceptibility against some beta-lactams, macrolides and clindamycin. Double-disk testing was carried out to evaluate erythromycin-resistant phenotypes. Data are presented using central tendency measures.
Results:
All tested strains were not resistant to beta-lactams and clindamycin; 16% of the strains were resistant to macrolides and all of them belonged to phenotype M.
Conclusions:
Susceptibility testing is recommended to identify possible changes in antibiotic resistance to streptococci.
More Related Videos
09:12Characterization of Inflammatory Responses During Intranasal Colonization with Streptococcus pneumoniae
Published on: January 17, 2014
08:58Isolation and Identification of Waterborne Antibiotic-Resistant Bacteria and Molecular Characterization of their Antibiotic Resistance Genes
Published on: March 3, 2023
Related Concept Videos
Defense Against Bacterial Pathogens
Phagocytes
Phagocytes are the frontline soldiers of the immune system. They include neutrophils and macrophages. Neutrophils are the most abundant type of white blood cell and are quickly mobilized to the site of infection. Macrophages are larger cells that patrol...
Development of Antibiotic Resistance
Determinants of Bacterial Pathogenicity and Virulence
Streptococcal Pharyngitis
Mechanism of Antibiotic Resistance in MRSA
Clinical Significance of Antibiotic Resistance