title: Intramammary preparations and cephalosporin resistance in S typhimurium.
authors.forename: P W
authors.initials: PW
authors.lastname: Guard
authors.forename: D
authors.initials: D
authors.lastname: O'Rourke
mesh_terms: D000818:Animals; D002417:Cattle; D002511:Cephalosporins / Q000494:pharmacology*; D004352:Drug Resistance, Microbial; D005260:Female; D012486:Salmonella typhimurium / Q000187:drug effects*
chemical_list: D002511:Cephalosporins