Multidrug resistance (MDR) and hypervirulence (hv) have been long considered distinct evolutionary traits for Klebsiella pneumoniae (Kp), a versatile human pathogen. The recent emergence of Kp strains combining these traits poses a serious global threat. In this article, we describe the phenotypic and genomic characteristics of an MDR hvKp isolate, MAR14-456, representative of a nosocomial outbreak in Moscow, Russia, that was recovered from a postoperative wound in a patient who later developed multiple abscesses, fatal sepsis, and septic shock. Broth microdilution testing revealed decreased susceptibility of MAR14-456 to carbapenems (MICs 0.5–2 mg/L) and a high-level resistance to most β-lactams, β-lactam-β-lactamase-inhibitor combinations, and non-β-lactam antibiotics, except ceftazidime-avibactam, amikacin, tigecycline, and colistin. Whole-genome sequencing using Illumina MiSeq and ONT MinION systems allowed to identify and completely assemble two conjugative resistance plasmids, a typical ‘European’ epidemic IncL/M plasmid that carries the gene of OXA-48 carbapenemase, and an IncFIIK plasmid that carries the gene of CTX-M-15 ESBL and other resistance genes. MLST profile, capsular, lipopolysaccharide, virulence genes encoded on chromosome and IncHI1B/FIB plasmid, and the presence of apparently functional type I-E* CRISPR-Cas system were all characteristic of hvKp ST23, serotype K1-O1v2. Phylogenetic analysis showed the closest relatedness of MAR14-456 to ST23 isolates from China. This report highlights the threat of multiple resistance acquisition by hvKp strain and its spread as a nosocomial pathogen.
Цель. Определить распространенность устойчивости к антибиотикам и продукции основных приобретенных механизмов резистентности (бета-лактамаз расширенного спектра [БЛРС] и карбапенемаз) у нозокомиальных штаммов Enterobacterales, а также генотипы и принадлежность к «международным клонам высокого риска» карбапенемазопродуцирующих штаммов Klebsiella pneumoniae, выделенных в различных регионах России в рамках многоцентрового эпидемиологического исследования «МАРАФОН 2015-2016». Материалы и методы. Всего исследовано 2786 неповторяющихся изолятов энтеробактерий, включая 1316 изолятов Klebsiella pneumoniae и 837 изолятов Escherichia coli, выделенных в 49 стационарах 25 городов России в 2015-2016 гг. Видовую идентификацию изолятов проводили методом MALDI-TOF масс-спектрометрии. Определение чувствительности выполняли референтным методом микро
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