Antibiotic resistant beta-hemolytic streptococci.
OBJECTIVE
An antibiotic-sensitivity study was conducted on 117 strains of group A streptococcus (GAS), 60 strains of group G streptococcus (GGS) and 20 strains of group C streptococcus (GCS) in order to understand current resistance trends.


METHODS
All strains were tested by the Kirby Bauer disc diffusion method to 15 antibiotics. Resistant strains were confirmed by testing the minimum inhibitory concentration (MIC) of antibiotics by broth dilution technique.


RESULTS
Among GAS, highest resistance was observed to tetracycline (27.4%) and erythromycin (16.2%). The GGS and GCS tested, showed similar resistance patterns.


CONCLUSIONS
All beta-hemolytic streptococci were susceptible to penicillin, amoxycillin, cephalosporins and linezolid. Resistance to erythromycin, tetracycline, clindamycin, chloramphenicol, and quinolones is emerging.
Lloyd
Charmaine A C
CA
Dr. A.L. Mudaliar Post Graduate Institute of Basic Medical Sciences, University of Madras, Chennai, India.
Jacob
Swarna E
SE
Menon
Thangam
T
D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D002648:Child; D024881:Drug Resistance, Bacterial; D006801:Humans; D007830:Larynx / Q000382:microbiology; D008826:Microbial Sensitivity Tests; D012307:Risk Factors; D012494:Sampling Studies; D012680:Sensitivity and Specificity; D013292:Streptococcus agalactiae / Q000187:drug effects* / Q000302:isolation & purification; D013297:Streptococcus pyogenes / Q000187:drug effects* / Q000302:isolation & purification
D000900:Anti-Bacterial Agents