Hypervirulent Klebsiella pneumoniae (HvKP) has become a major pathogen that causes severe human infections such as pyogenic liver abscesses, pneumonia, and endophthalmitis. HvKP strains typically possess a thick, hypermucoid capsule and therefore produce mucoid colonies that generate a positive result in string test. HvKP exhibits features of enhanced virulence including production of a larger amount of capsule polysaccharide (CPS), ability to resist phagocytosis, and distant metastases. The cap