Letter: Tetracycline-resistant pneumococci.
D001315:Australia; D004352:Drug Resistance, Microbial; D009512:New Guinea; D010403:Penicillin Resistance; D013296:Streptococcus pneumoniae / Q000187:drug effects*; D013752:Tetracycline / Q000494:pharmacology*
D013752:Tetracycline