title: Bacteroides fragilis resistant to metronidazole after long-term therapy.
mesh_terms: D000328:Adult; D001442:Bacteroides Infections / Q000188:drug therapy*; D001441:Bacteroides fragilis / Q000187:drug effects*; D004352:Drug Resistance, Microbial; D006801:Humans; D008297:Male; D008795:Metronidazole / Q000494:pharmacology / Q000627:therapeutic use*; D013997:Time Factors
chemical_list: D008795:Metronidazole