Tetracycline-resistant pneumococci.
D004352:Drug Resistance, Microbial; D006801:Humans; D012703:Serotyping; D013296:Streptococcus pneumoniae / Q000187:drug effects* / Q000302:isolation & purification; D013752:Tetracycline / Q000494:pharmacology*
D013752:Tetracycline