Clinical and Molecular Characteristics of Patients with Bloodstream Infections Caused by KPC and NDM Co-Producing Carbapenem-Resistant Klebsiella pneumoniae

Abstract

Jiayang Li,1,2,* Wenqi Wu,3,* Meilin Wu,4 Zhitao Zhou,4 Jiajie Wang,1 Mingjie Qiu,4 Li Xu,4 Jianan Ren,1,2 Xiuwen Wu1,2 1School of Medicine, Southeast University, Nanjing, People’s Republic of China; 2Research Institute of General Surgery, Jinling Hospital, School of Medicine, Southeast University, Nanjing, People’s Republic of China; 3School of Medicine, Nanjing University, Nanjing, People’s Republic of China; 4Nanjing Medical University, Nanjing, People’s Republic of China*These authors contributed equally to this workCorrespondence: Xiuwen Wu; Jianan Ren, Research Institute of General Surgery, Jinling Hospital, School of Medicine, Southeast University, 305 East Zhongshan Road, Nanjing, 210002, People’s Republic of China, Email [email protected]; [email protected]: Klebsiella pneumoniae carbapenemase (KPC) and New Delhi metallo-β-lactamase (NDM) co-producing carbapenem-resistant Klebsiella pneumoniae (KPC-NDM-CRKP) isolates have been increasingly reported worldwide but have not yet been systematically studied. Thus, we have conducted a study to compare the risk factors, molecular characteristics, and mortality involved in clinical bloodstream infections (BSIs) caused by KPC-NDM-CRKP and KPC-CRKP strains.Methods: A retrospective study was conducted on 231 patients with BSIs caused by CRKP at Jinling Hospital in China from January 2020 to December 2022. Antimicrobial susceptibility testing, carbapenemase genes detection and whole-genome sequencing were performed subsequently.Results: Overall, 231 patients were included in this study: 25 patients with KPC-NDM-CRKP BSIs and 206 patients with KPC-CRKP BSIs. Multivariate analysis implicated ICU-acquired BSI, surgery within 30 days, and longer stay of hospitalization prior to CRKP isolation as independent risk factors for KPC-NDM-CRKP BSIs. The 30-day mortality rate of the KPC-NDM-CRKP BSIs group was 56% (14/25) compared with 32.5% (67/206) in the KPC-CRKP BSIs control group (P = 0.02). The ICU-acquired BSIs, APACHE II score at BSI onset, and BSIs caused by KPC-NDM-CRKP were independent predictors for 30-day mortality in patients with CRKP bacteremia. The most prevalent ST in KPC-NDM-CRKP isolates was ST11 (23/25, 92%), followed by ST15 (2/25, 8%).Conclusion: In patients with CRKP BSIs, KPC-NDM-CRKP was associated with an excess of mortality. The likelihood that KPC-NDM-CRKP will become the next “superbug” highlights the significance of epidemiologic surveillance and clinical awareness of this pathogen.Keywords: KPC and NDM co-producing carbapenem-resistant Klebsiella pneumoniae, Bloodstream infections, risk factors, molecular characteristics, mortality

Keywords

• kpc and ndm co-producing carbapenem-resistant klebsiella pneumoniae
• bloodstream infections
• risk factors
• molecular characteristics
• mortality