title: The incidence of R factors among coliform bacteria.
mesh_terms: D000667:Ampicillin / Q000494:pharmacology; D002509:Cephaloridine / Q000494:pharmacology; D003227:Conjugation, Genetic; D004926:Escherichia coli / Q000187:drug effects*; D005006:Ethnicity; D005827:Genetics, Microbial; D005839:Gentamicins / Q000494:pharmacology; D006801:Humans; D009268:Nalidixic Acid / Q000494:pharmacology; D009582:Nitrofurantoin / Q000494:pharmacology; D010403:Penicillin Resistance; D012424:Rural Population; D013019:South Africa; D013307:Streptomycin / Q000494:pharmacology; D013752:Tetracycline / Q000494:pharmacology; D014505:Urban Population
chemical_list: D005839:Gentamicins; D009268:Nalidixic Acid; D000667:Ampicillin; D009582:Nitrofurantoin; D013752:Tetracycline; D002509:Cephaloridine; D013307:Streptomycin