title: Increasing resistance of Bacteroides fragilis group strains to metronidazole in Spain between 1977 and 1982.
mesh_terms: D001441:Bacteroides fragilis / Q000187:drug effects*; D004352:Drug Resistance, Microbial; D008795:Metronidazole / Q000494:pharmacology*; D013030:Spain; D013997:Time Factors
chemical_list: D008795:Metronidazole