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New Delhi metallo-β-lactamase (NDM-1)-producing Klebsiella pneumoniae of sequence type ST11: first identification in a hospital of central Italy.
Letters in Applied Microbiology 2020 September 12
The emergence of novel resistant markers hampers the efficacy of beta-lactam antibiotics to treat infections caused by microrganisms carrying such resistances. This study investigated the antimicrobial susceptibility pattern, the carpapenem associated determinants and the molecular epidemiology of Klebsiella pneumoniae showing a New Delhi (NDM) metallo-β-lactamase phenotype, isolated from a patient admitted to intensive care unit of the main hospital for acute care of Molise region, central Italy. Antimicrobial susceptibility was assessed for nineteen antibiotics by disc diffusion and agar dilution methods. Carbapenem-associated resistance determinants were detected through gene-specific amplifications, targeting blaNDM-1 , blaSHV and blaTEM , blaCTX-M , blaKPC , blaVIM , blaIMP , blaGES and blaOXA-48-lixe . Molecular characterization was carried out through Multilocus sequence typing (MLST). The strain showed a multidrug resistant profile, and PCR and sequencing confirmed the presence of blaNDM-1 gene. Among multiple determinants tested, the isolate, assigned to the sequence type ST11, only harbored blaSHV and blaTEM genes. This is the first report of NDM-1 variant in the regional healthcare setting for acute patients, raising significant concerns about the increase of the resistance spread through a different mechanism from the endemic KPC carbapenemase, and underlining the circulation of a virulent clone never identified before in this area.
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