Characterisation of antibiotic resistance ofSalmonellaisolated from dog treats in Japan

Abstract

AbstractDog treats might be contaminated withSalmonella. In Canada and the USA, outbreaks of human salmonellosis related to exposure to animal-derived dog treats were reported. Consequently, surveillance data onSalmonellacontamination of dog treats have been gathered in many countries, but not in Japan. In the current study, we investigated whether dog treats in Japan were contaminated withSalmonella. Overall, 303 dog treats (of which 255 were domestically produced) were randomly collected and the presence ofSalmonellainvestigated. Seven samples were positive forSalmonella entericasubsp.enterica. Among these isolates, three were identified as serovar 4,5,12:i:–; two were serovar Rissen; and two were serovar Thompson. All serovar 4,5,12:i:– and Thompson isolates were resistant to one or more drugs. Two serovar Rissen isolates were fully susceptible to all tested antimicrobial agents. AllSalmonellaisolates were susceptible to cefotaxime, ciprofloxacin and nalidixic acid. The geneblaTEMwas detected in two serovar 4,5,12:i:– isolates. TheblaCTX−MandblaCMYgenes were not detected in any isolates. This study demonstrated that dog treats in Japan could constitute a potential source of dog and humanSalmonellainfections, including multidrug-resistantSalmonellaisolates.