Letter: Antibiotic discs active against resistant organisms.
D000667:Ampicillin / Q000494:pharmacology; D000900:Anti-Bacterial Agents / Q000494:pharmacology; D008722:Methods; D008826:Microbial Sensitivity Tests / Q000592:standards*; D010400:Penicillin G / Q000494:pharmacology; D010403:Penicillin Resistance; D013210:Staphylococcus / Q000187:drug effects
D000900:Anti-Bacterial Agents; D000667:Ampicillin; D010400:Penicillin G