title: I. Prevalence of extrachromosomal drug resistance. Changes in asusceptibility of selected pathogenic bacteria to widely used antibiotics.
mesh_terms: D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D001900:Boston; D004754:Enterobacter / Q000187:drug effects; D004755:Enterobacteriaceae / Q000187:drug effects*; D004926:Escherichia coli / Q000187:drug effects; D006761:Hospitals; D007709:Klebsiella / Q000187:drug effects; D008712:Methicillin / Q000494:pharmacology; D008826:Microbial Sensitivity Tests; D010403:Penicillin Resistance; D011511:Proteus / Q000187:drug effects; D012705:Serratia / Q000187:drug effects; D013210:Staphylococcus / Q000187:drug effects*; D013296:Streptococcus pneumoniae / Q000187:drug effects*
chemical_list: D000900:Anti-Bacterial Agents; D008712:Methicillin