title: Development of resistant bacteria isolated from dogs with otitis externa or urinary tract infections after exposure to enrofloxacin in vitro.
abstract: Minimum inhibitory concentrations for enrofloxacin were determined for 63 bacterial isolates from dogs with otitis externa or urinary tract infections. Development of resistant mutants was determined after exposing the isolates to enrofloxacin in vitro for up to five serial passages. Results indicated that Pseudomonas aeruginosa and Enterococcus spp isolates exposed to enrofloxacin developed resistance rapidly, whereas Klebsiella, Proteus, and Streptococcus spp were less likely to develop resistance. Despite the presence of enrofloxacin pressure, no resistant bacteria developed in the Escherichia coli and staphylococcal isolates. In many isolates, susceptibility patterns changed from susceptible to intermediate.
authors.affiliation: Department of Medical Microbiology and Parasitology, College of Veterinary Medicine, University of Georgia, Athens, GA 30602, USA.
authors.forename: Amy M
authors.initials: AM
authors.lastname: Brothers
authors.forename: Penelope S
authors.initials: PS
authors.lastname: Gibbs
authors.forename: Richard E
authors.initials: RE
authors.lastname: Wooley
mesh_terms: D000818:Animals; D000890:Anti-Infective Agents / Q000494:pharmacology* / Q000627:therapeutic use; D004283:Dog Diseases / Q000188:drug therapy / Q000382:microbiology*; D004285:Dogs; D024881:Drug Resistance, Bacterial; D000077422:Enrofloxacin; D016983:Enterococcus / Q000187:drug effects / Q000302:isolation & purification; D004926:Escherichia coli / Q000187:drug effects / Q000302:isolation & purification; D024841:Fluoroquinolones; D006090:Gram-Negative Bacteria / Q000187:drug effects* / Q000302:isolation & purification; D006094:Gram-Positive Bacteria / Q000187:drug effects* / Q000302:isolation & purification; D007709:Klebsiella / Q000187:drug effects / Q000302:isolation & purification; D008826:Microbial Sensitivity Tests / Q000662:veterinary; D010032:Otitis Externa / Q000382:microbiology / Q000662:veterinary*; D011513:Proteus mirabilis / Q000187:drug effects / Q000302:isolation & purification; D011550:Pseudomonas aeruginosa / Q000187:drug effects / Q000302:isolation & purification; D015363:Quinolones / Q000494:pharmacology* / Q000627:therapeutic use; D013210:Staphylococcus / Q000187:drug effects / Q000302:isolation & purification; D014552:Urinary Tract Infections / Q000382:microbiology / Q000662:veterinary*
chemical_list: D000890:Anti-Infective Agents; D024841:Fluoroquinolones; D015363:Quinolones; D000077422:Enrofloxacin