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Research Article: Within-Host Resistance and Virulence Evolution of a Hypervirulent Carbapenem-Resistant Klebsiella pneumoniae ST Under Antibiotic Pressure

Date Published: 2023-11-16

Abstract:
Klebsiella pneumoniae (KP) is an opportunistic pathogen that causes a wide range of infections, including pneumonia, urinary tract infections, bacteremia and meningitis. In recent years, the continuous evolution of hypervirulent or carbapenem-resistant plasmids has led to the emergence of hypervirulent and carbapenem-resistant Klebsiella pneumoniae(hv-CRKP)., These strains are considered real ‘superbugs’ as they are not only hypervirulent but also multidrug resistant, causing severe and often fatal infections.,, In China, the most prevalent type of hv-CRKP was ST-KL. The formation mechanism of hv-CRKP can be divided into the following three paths: (i) Carbapenem-resistance plasmids were acquired from K/K hypervirulent Klebsiella pneumoniae(hvKP) and evolved into CR-hvKP. Carbapenem-resistant plasmids are usually conjugative and can be transmitted horizontally among different strains., (ii) Carbapenem-resistant Klebsiella pneumoniae(CRKP) acquired virulence plasmids and evolved into hv-CRKP. However, virulence plasmids are generally considered non-mobilizable owing to the lack of tra gene locus for plasmid conjugation. (iii) KP directly acquired hybrid plasmids encoding carbapenem resistance and hypervirulence, which led to the rapid evolution of KP into hv-CRKP or CR-hvKP.– It seems easier for hvKP strains to obtain carbapenem-resistant plasmids than for CRKP strains to obtain nonconjugative virulence plasmids. But in fact, hv-CRKP strains producing KPC carbapenemase has an overwhelming dominance of CR-hvKP strains. Outbreaks caused by hv-CRKP, especially ST hv-CRKP, have been reported in hospitals in China.,

Introduction:
Klebsiella pneumoniae (KP) is an opportunistic pathogen that causes a wide range of infections, including pneumonia, urinary tract infections, bacteremia and meningitis. In recent years, the continuous evolution of hypervirulent or carbapenem-resistant plasmids has led to the emergence of hypervirulent and carbapenem-resistant Klebsiella pneumoniae (hv-CRKP). , These strains are considered real ‘superbugs’ as they are not only hypervirulent but also multidrug resistant, causing severe and often fatal infections. ,…

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