title: Erythromycin-resistant group A beta-hemolytic streptococci: prevalence at four medical centers.
mesh_terms: D004352:Drug Resistance, Microbial; D004917:Erythromycin / Q000494:pharmacology*; D006772:Hospitals, Military; D006801:Humans; D013297:Streptococcus pyogenes / Q000187:drug effects* / Q000302:isolation & purification; D014481:United States
chemical_list: D004917:Erythromycin