title: Presence of antimicrobial resistance and antimicrobial use in sows are risk factors for antimicrobial resistance in their offspring.
abstract: This study investigated whether antimicrobial-resistant Escherichia coli in apparently healthy sows and antimicrobial administration to sows and piglets influenced antimicrobial resistance in fecal commensal E. coli from piglets. Sixty sows from three herds and three of their piglets were sampled at several time points. Antimicrobial usage data during parturition and farrowing were collected. Clinical resistance was determined for two isolates per sampling time point for sows and piglets using disk diffusion. Only 27.4% of E. coli isolates from newborn piglets showed no resistance. Resistance to one or two antimicrobial classes equaled 41.2% and 46.8% in isolates from sows and piglets, respectively, for the overall farrowing period. Multiresistance to at least four classes was found as frequently in sows (15.6%) as in piglets (15.2%). Antimicrobial resistance in piglets was influenced by antimicrobial use in sows and piglets and by the sow resistance level (p≤0.05). Using aminopenicillins and third-generation cephalosporins in piglets affected resistance levels in piglets (odds ratios [OR] >1; p≤0.05). Using enrofloxacin in piglets increased the odds for enrofloxacin resistance in piglets (OR=26.78; p≤0.0001) and sows at weaning (OR=4.04; p≤0.05). For sows, antimicrobial exposure to lincomycin-spectinomycin around parturition increased the resistance to ampicillin, streptomycin, trimethoprim-sulfadiazine in sows (OR=21.33, OR=142.74, OR=18.03; p≤0.05) and additionally to enrofloxacin in piglets (OR=7.50; p≤0.05). This study demonstrates that antimicrobial use in sows and piglets is a risk factor for antimicrobial resistance in the respective animals. Moreover, resistance determinants in E. coli from piglets are selected by using antimicrobials in their dam around parturition.
authors.affiliation: 1 Veterinary Epidemiology Unit, Department of Reproduction, Obstetrics and Herd Health, Faculty of Veterinary Medicine , Ghent University, Merelbeke, Belgium .
authors.forename: Bénédicte
authors.initials: B
authors.lastname: Callens
authors.forename: Christel
authors.initials: C
authors.lastname: Faes
authors.forename: Dominiek
authors.initials: D
authors.lastname: Maes
authors.forename: Boudewijn
authors.initials: B
authors.lastname: Catry
authors.forename: Filip
authors.initials: F
authors.lastname: Boyen
authors.forename: Delphine
authors.initials: D
authors.lastname: Francoys
authors.forename: Ellen
authors.initials: E
authors.lastname: de Jong
authors.forename: Freddy
authors.initials: F
authors.lastname: Haesebrouck
authors.forename: Jeroen
authors.initials: J
authors.lastname: Dewulf
mesh_terms: D000818:Animals; D000900:Anti-Bacterial Agents / Q000627:therapeutic use*; D001530:Belgium; D004197:Disease Reservoirs; D004352:Drug Resistance, Microbial; D004363:Drug Utilization; D004926:Escherichia coli / Q000187:drug effects* / Q000235:genetics / Q000302:isolation & purification; D004927:Escherichia coli Infections / Q000382:microbiology / Q000635:transmission / Q000662:veterinary*; D005243:Feces / Q000382:microbiology; D005260:Female; D018445:Infectious Disease Transmission, Vertical / Q000662:veterinary; D049590:Postpartum Period; D011247:Pregnancy; D012641:Selection, Genetic; D034421:Sus scrofa / Q000382:microbiology*; D013552:Swine; D013553:Swine Diseases / Q000382:microbiology* / Q000635:transmission; D014886:Weaning
chemical_list: D000900:Anti-Bacterial Agents