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An outpatient clinic as a potential site of transmission for an outbreak of NDM-producing Klebsiella pneumoniae ST716: a study using whole-genome sequencing.

Background: The incidence of nosocomial infections due to carbapenem-resistant Klebsiella pneumoniae is increasing worldwide. Whole genome sequencing (WGS) can help elucidate the transmission route of nosocomial pathogens.

Methods: We combined WGS and epidemiological data to analyze an outbreak of NDM-producing K. pneumoniae that occurred in two Belgian hospitals situated about 50 miles apart. We characterized 74 NDM-producing K. pneumoniae isolates [Hospital A (n=9); Hospital B (n=24) and 41 contemporary isolates from 15 other Belgian hospitals] using pulsed-field gel electrophoresis and WGS.

Results: A K. pneumoniae ST716 clone was identified as being responsible for the outbreak with 9/9 strains from Hospital A and 20/24 strains from Hospital B sharing a unique pulsotype and being clustered together on WGS (compared with 1/41 isolates from other Belgian hospitals). We identified the outpatient clinic of Hospital B as the probable bridging site between the hospitals after combining epidemiological, phylogenetic and resistome data. We also identified the patient who probably caused the transmission. In fact, all but one strain from Hospital A carried a Tn1331-like transposon, whereas none of the Hospital B isolates did. The patient from Hospital A who did not have the Tn1331-like transposon was treated at the outpatient clinic of Hospital B on the same day as the first NDM-producing K. pneumoniae positive patient from Hospital B.

Conclusions: The results from our WGS-guided investigation highlight the importance of implementing adequate infection control measures in outpatient settings, especially when healthcare delivery moves from acute care facilities to outpatient clinics.

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