Abstract
Here we describe a case of in vivo horizontal interspecies transmission of a KPC-2-producing plasmid from a Klebsiella pneumoniae to an Enterobacter aerogenes strain in the same patient. The patient's gut flora initially contained a carbapenem-susceptible E. aerogenes strain and 10 days after admission a KPC-2-positive K. pneumoniae. Three months after admission, a KPC-2-positive E. aerogenes was identified in fecal surveillance cultures. This isolate was isogenic with the initial E. aerogenes and contained a KPC-2-coding plasmid identical to that of the K. pneumoniae. The patient developed bacteraemia by the KPC-2-positive K. pneumoniae 17 days after her first colonization. In vivo horizontal transmission of blaKPC-carrying plasmids between bacterial species underscores the importance of antibiotic stewardship along with implementation of infection control measures for the containment of KPC-producers.
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