Clinical characteristics and molecular epidemiology of KPC-NDM co-producing carbapenem-resistant Klebsiella pneumoniae in China: a multicentre retrospective case-control study

National Natural Science Foundation of China (82472323 and 82172306), Zhejiang Province Natural Science Foundation of China (LQN26H200003, LR25H200001, LQN25H200002, MS25H190009), the "Pioneer" and "Leading Goose" R&D Program of Zhejiang Province (2025C02187), the Zhejiang Provincial Medical and Health Technology Project (2025HY0224) and Zhejiang Provincial Disease Prevention and Control Science and Technology Program (2025JK063). We appreciate the statistical support provided by Hui Liu (Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, China).