The spread of Klebsiella pneumoniae carbapenemase (KPC)-producing K. pneumoniae continues to increase, and the possible development of KPC-producing K. pneumoniae infections in cystic fibrosis (CF) patients is a matter of concern. Here, we describe the establishment of a chronic lung infection due to a colistin-resistant KPC-producing K. pneumoniae isolate in an Italian CF patient.
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http://dx.doi.org/10.1128/JCM.03199-14 | DOI Listing |
Infect Drug Resist
December 2024
Intensive Care Medical Center, Tongji Hospital, School of Medicine, Tongji University, Shanghai, 200065, People's Republic of China.
Objective: This study aimed to evaluate the in vitro activity of omadacycline (OMC) and OMC-based combination therapy against carbapenem-resistant (CRKP).
Methods: The broth microdilution assay assessed the in vitro susceptibility of CRKP to OMC. The checkerboard assay was performed to evaluate the activity of OMC combined with polymyxin B (PB), amikacin (AN), or meropenem (MEM) against KPC-producing (class A) CRKP strains, and OMC combined with PB, aztreonam (ATM), MEM, or AN against class B and class A plus class B CRKP strains.
Cefiderocol (FDC), a siderophore-cephalosporin conjugate, is the newest option for treating infection with carbapenem-resistant gram-negative bacteria. We identified a novel mechanism contributing to decreased FDC susceptibility in Klebsiella pneumoniae clinical isolates. The mechanism involves 2 coresident plasmids: pKpQIL, carrying variants of bla carbapenemase gene, and pKPN, carrying the ferric citrate transport (FEC) system.
View Article and Find Full Text PDFJ Antimicrob Chemother
December 2024
Microbiology and Virology Unit, Department of Pathology, Azienda Ospedaliera Universitaria Integrata Di Verona, Verona, Italy.
Objectives: To evaluate the in vitro activity of ceftazidime/avibactam, meropenem/vaborbactam, imipenem/relebactam and comparators against KPC-producing Klebsiella pneumoniae (KPC-Kp) clinical isolates collected from a multicentre study in Italy (2022-23) and genomic characterization of the molecular mechanisms causing resistance.
Methods: Consecutive KPC-Kp isolates from blood cultures (n = 264) were collected from 14 hospital centres in the period 2022-23. Antimicrobial susceptibility testing was performed using broth microdilution.
JAC Antimicrob Resist
December 2024
Department of Public Health and Infectious Diseases, Sapienza University of Rome, Piazzale Aldo Moro 5, Rome 00185, Italy.
Background: Bloodstream infections (BSIs) caused by KPC-producing (KPC-Kp) are still associated with high mortality, and the game-changing drug ceftazidime/avibactam has shown suboptimal pharmacokinetics in some clinical settings. Ceftazidime/avibactam renal dose adjustment has recently been identified as an independent risk factor for mortality.
Objectives: To investigate the effect of ceftazidime/avibactam renal dose adjustment on mortality.
Antimicrob Agents Chemother
December 2024
Department of Laboratory Medicine, Renji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China.
The global rise of carbapenem-resistant , including strains producing carbapenemase (KPC) types, poses a significant public health challenge due to their resistance to critical antibiotics. Treatment options for infections caused by KPC-producing (KPC-KP) are increasingly limited, particularly as these strains develop resistance to last-line antibiotics such as ceftazidime/avibactam and colistin. This study investigates the evolution of antibiotic resistance and persistence in a series of clonally related ST11 KPC-KP strains isolated from a single patient undergoing extended antimicrobial treatment.
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