[Transition of drug sensitivity of group A streptococci in the last 6 years (1967-72)].
D000900:Anti-Bacterial Agents / Q000494:pharmacology; D004352:Drug Resistance, Microbial; D005500:Follow-Up Studies; D013297:Streptococcus pyogenes / Q000187:drug effects*
D000900:Anti-Bacterial Agents