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Administration of enrofloxacin to mice via subcutaneous injection or per os routes resulted in equivalent levels of bioactive enrofloxacin within the intestine, but bioactivity was short-lived (&lt;48 h after cessation). Enrofloxacin administration did not affect densities of total bacteria, Firmicutes, or Bacteroidetes in digesta and had modest impacts on densities of Enterobacteriaceae. All mice inoculated with C. jejuni NCTC 11168 became persistently colonized by the bacterium. Enrofloxacin reduced C. jejuni cell densities within the cecal and colonic digesta for all treatments, and densities shed in feces as a function of antibiotic duration. None of the C. jejuni isolates recovered from mice after administration of enrofloxacin (n = 260) developed resistance to ciprofloxacin regardless of method or duration of administration. Furthermore, only modest shifts in the minimum inhibitory concentration of the isolates by treatment were noted. The study findings indicate that the risk posed by short-term subcutaneous administration of enrofloxacin for the development of fluoroquinolone resistance in mammals is low. <\/jats:p>","DOI":"10.1139\/cjm-2017-0741","type":"journal-article","created":{"date-parts":[[2018,5,11]],"date-time":"2018-05-11T21:34:26Z","timestamp":1526074466000},"page":"681-694","update-policy":"https:\/\/doi.org\/10.1139\/csp-crossmark-policy","source":"Crossref","is-referenced-by-count":9,"title":["Therapeutic administration of enrofloxacin in mice does not select for fluoroquinolone resistance in <i>Campylobacter jejuni<\/i>"],"prefix":"10.1139","volume":"64","author":[{"given":"G. 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