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Background  Intensive medical care in companion animal clinics could pose a risk for the selection and dissemination of multidrug-resistant organisms (MDROs). Infection prevention and control (IPC) concepts are key measures to reduce the spread of MDROs, but data on IPC standards in companion animal clinics is sparse. The study assessed IPC standards in seven companion animal clinics and practices in Switzerland by structured IPC audits and combined results with environmental MDRO contamination and MDRO carriage of the personnel.    Methods  IPC audits were held between August 2018 and January 2019. The observations in 34 IPC areas were scored based on predefined criteria (not fulfilled/partially fulfilled/fulfilled = score 0/1/2). Environmental swabs and nasal and stool samples from veterinary personnel were tested for methicillin-resistant (MR) staphylococci and macrococci and for colistin-resistant, extended-spectrum β-lactamase- and carbapenemase-producing (CP)  Enterobacterales  (CPE). Species was identified by MALDI-TOF MS, antimicrobial resistance determined by microdilution and β-lactam resistance gene detection, and genetic relatedness assessed by REP−/ERIC-PCR and multilocus sequence typing.    Results  Of a maximum total IPC score of 68, the institutions reached a median (range) score of 33 (19–55). MDROs were detected in median (range) 8.2% (0–33.3%) of the sampling sites. Clinics with low IPC standards showed extensive environmental contamination, i.e. of intensive care units, consultation rooms and utensils. CPE were detected in two clinics; one of them showed extensive contamination with CP  Klebsiella pneumoniae  (ST11,  bla  OXA-48 ) and MR  Staphylococcus pseudintermedius  (ST551,  mecA ). Despite low IPC scores, environmental contamination with MDROs was low in primary opinion practices. Three employees were colonized with  Escherichia coli  ST131 ( bla  CTX-M-15 ,  bla  CTX-M-27 ,  bla  CTX-M-14 ). Two employees carried CP  E. coli  closely related to environmental (ST410,  bla  OXA-181 ) and patient-derived isolates (ST167,  bla  NDM-5 ). MR  Staphylococcus aureus  (ST225,  mecA ) and MR  S. pseudintermedius  (ST551,  mecA ) of the same sequence types and with similar resistance profiles were found in employees and the environment in two clinics.    Conclusions  The study indicates that IPC standards in companion animal clinics are variable and that insufficient IPC standards could contribute to the evolution of MDROs which can be transferred between the environment and working personnel. The implementation of IPC concepts in companion animal clinics should urgently be promoted.

antimicrobial resistance and infection control

Poor infection prevention and control standards are associated with environmental contamination with carbapenemase-producing Enterobacterales and other multidrug-resistant bacteria in Swiss companion animal clinics