title: Shedding of cephalosporin resistant Escherichia coli in pigs from conventional farms after early treatment with antimicrobials.
abstract: This study assessed the dynamics of cephalosporin resistant (CR) E. coli populations during the life cycle of pigs treated early in life with ceftiofur or tulathromycin. The study was conducted at eight conventional pig farms; four for each treatment with ceftiofur or tulathromycin. At each farm, 70 7-day-old piglets were divided into two groups: a control group (n = 30) and a treatment group (n = 40). Faecal samples were collected on day 0 and on days 2, 7 and 180 post-treatment. Sows were also sampled on day 0. CR E. coli were selected on MacConkey agar with ceftriaxone. On five farms, 7-day-old piglets excreted CR E. coli before treatment associated with the presence of CR E. coli in sows. The occurrence of CR E. coli positive animals decreased with increasing piglet age. The remaining three farms tested negative for CR E. coli during the study period. Results demonstrated great variability in the frequency of CR E. coli positive animals between farms, independent of treatment. Treatment with ceftiofur resulted in a transitory increase in the counts of CR E. coli after 48 h. However, other risk factors including the presence of CR E. coli in sows and animal age were more important than antimicrobial treatment. Accordingly, intervention strategies targeting sows would likely have a beneficial effect in reducing the occurrence of antimicrobial resistance in primary pig production.
authors.affiliation: Centre de Recerca en Sanitat Animal (CReSA) - Institut de Recerca i Tecnologia Agroalimentàries (IRTA), Campus UAB, 08193 Barcelona, Spain.
authors.forename: Karla
authors.initials: K
authors.lastname: Cameron-Veas
authors.affiliation: Centro de Vigilancia Sanitaria Veterinaria, Universidad Complutense de Madrid, 28040 Madrid, Spain; Departamento de Sanidad Animal, Facultad de Veterinaria, Universidad Complutense de Madrid, 28040 Madrid, Spain.
authors.forename: Miguel A
authors.initials: MA
authors.lastname: Moreno
authors.affiliation: Departamento de Producción Animal, Universidad de Lleida, 25003 Lleida, Spain.
authors.forename: Lorenzo
authors.initials: L
authors.lastname: Fraile
authors.affiliation: Centre de Recerca en Sanitat Animal (CReSA) - Institut de Recerca i Tecnologia Agroalimentàries (IRTA), Campus UAB, 08193 Barcelona, Spain. Electronic address: lourdes.migura@irta.cat.
authors.forename: Lourdes
authors.initials: L
authors.lastname: Migura-Garcia
mesh_terms: D000822:Animal Husbandry / Q000379:methods; D000818:Animals; D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D057138:Bacterial Shedding; D018550:Cephalosporin Resistance; D002511:Cephalosporins / Q000494:pharmacology*; D004187:Disaccharides / Q000494:pharmacology*; D004926:Escherichia coli / Q000187:drug effects*; D004927:Escherichia coli Infections / Q000453:epidemiology / Q000382:microbiology / Q000662:veterinary*; D005243:Feces / Q000382:microbiology; D006571:Heterocyclic Compounds / Q000494:pharmacology*; D012307:Risk Factors; D013030:Spain / Q000453:epidemiology; D013552:Swine; D013553:Swine Diseases / Q000453:epidemiology* / Q000382:microbiology; D018942:Macrolides
chemical_list: D000900:Anti-Bacterial Agents; D002511:Cephalosporins; D004187:Disaccharides; D006571:Heterocyclic Compounds; C053503:ceftiofur; C485204:tulathromycin; D018942:Macrolides
keywords: Ceftiofur; Cephalosporins; E. coli; Pigs; Tulathromycin