Abstract

OXA-244-producing Escherichia coli (OXA-244-Ec) has disseminated in Europe, mostly in the community. In Poland it has spread since 2017, especially in 2023, but in contrast to other countries, all isolates have been identified in hospitals so far. The isolates (n = 101) represented one large and two limited outbreaks in different regions, and multiple epidemiologically and genetically non-related organisms. The OXA-244-Ec population consisted of 14 STs, with ST38 dominating. The ST38 isolates belonged to two major lineages, Clusters A and B, responsible for two of the hospital outbreaks. Enhanced concern and vigilance are necessary in the OXA-244-Ec surveillance.

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