Mon Sep 23 17:44:31 UTC 2024: ## Superbug’s Secret Weapon Uncovered: New Research Identifies Key Genetic Factor Driving Klebsiella pneumoniae’s Virulence
**Buffalo, NY** – A team of researchers at the University at Buffalo has identified the genetic culprit responsible for turning the common bacterium Klebsiella pneumoniae into a deadly, drug-resistant superbug. Their findings, published in the journal *eBioMedicine*, could lead to new treatments and diagnostic tests to combat this growing global health threat.
Hypervirulent Klebsiella pneumoniae (hvKp) emerged over a decade ago, capable of infecting and severely sickening even healthy individuals. Unlike its classical counterpart, which typically infects only sick or immunocompromised patients, hvKp can spread throughout the community and has developed resistance to many antibiotics, including last-resort carbapenems.
Dr. Thomas A. Russo, senior author of the study and a professor at the University at Buffalo, has been tracking hvKp since 2011 when he treated his first case. His team’s research has now pinpointed the key genetic factor driving hvKp’s virulence: a large plasmid called pVir. This plasmid contains multiple genes, some of which enhance virulence and/or confer antibiotic resistance.
“While the plasmid was known to contribute to hypervirulence, its precise role and the role of specific virulence factors were not well-defined,” explained Dr. Russo. The researchers conducted a systematic investigation of hvKp strains, removing pVir and other virulence factors in various combinations. Their findings strongly suggested that pVir is the primary genetic determinant that transforms classical K. pneumoniae into hvKp.
The study also identified additional, yet-to-be-identified virulence factors encoded by pVir. This discovery opens a new avenue for developing targeted therapies to combat hvKp.
“The genetic factors identified in this study could be potential therapeutic targets for the development of countermeasures,” said Dr. Russo.
Previous research from Dr. Russo’s team had identified five specific genes on the plasmid linked to hypervirulence, which could be crucial for developing a diagnostic test for hvKp. Currently, laboratories cannot differentiate between classical and hypervirulent strains, delaying diagnosis and treatment.
The study’s findings provide critical insights into hvKp’s evolution and behavior, paving the way for more effective prevention, treatment, and control strategies. This research is a significant step towards combating this global health threat and safeguarding public health.
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