Urinary Tract Infections (UTIs) linked with Klebsiella pneumoniae pose significant health risks in medical facilities. In a seminal study investigating this healthcare challenge in a tertiary healthcare facility based in Beijing, China, in-depth genomic profiling shed light on the challenges associated with effectively treating these infections.
Twenty strains of K. pneumoniae collected over a duration of 2020-2021 underwent whole-genome sequencing. Nineteen different antibiotic compounds were used to test each strain’s susceptibility. Through data extrapolated from the Whole Genome Sequencing (WGS), researchers were able to determine multi-locus sequence types (MLSTs) and the serotypes of the bacteria. Through De novo assemblies, the study could pinpoint resistance and virulence genes, highlighting the challenges in treating UTIs caused by the bacteria.
The study surfaced nine unique sequence types (STs) and twelve K-serotypes among the collected K. pneumoniae strains. Carbapenem-resistant K. pneumoniae (CRKP) strains showcased the presence of carbapenemase blaKPC-2 (n=7). A few CRKP strains showed increased resistance to Polymyxin B due to the IS5-like sequence’s insertion in the mgrB gene. These CRKP strains were also part of a transmission event in the Intensive Care Unit.
Multiple replicons co-carrying multiple plasmids were identified through long-read assemblies, underscoring the complexity of UTIs caused by K. pneumoniae. The study also documented the acquisition of a new IncM2_1 type blaCTX-M-3 positive plasmid from one ICU transferee patient. The research concluded that K. pneumoniae is a critical pathogen in UTIs and underlined the urgent need for improved genomic surveillance to combat this public health threat and the antimicrobial resistance it demonstrates.
In 2020, of the total 862 urine samples collected, 26.4% produced positive bacterial cultures. In 2021, among the 1929 urine samples collected, 19.2% tested positive. An estimated 14.9% and 12.1% tested positive for Klebsiella species in 2020 and 2021, respectively.
Amid mounting antibiotic resistance threats, providing the most effective treatment has become increasingly challenging. These insights into the genomic characteristics of UTI-causing pathogens could significantly improve patient outcomes in hospital settings, particularly for elderly patients.