Volume 69 (2016) Issue 5 Pages 357-360
We investigated the molecular epidemiologic characteristics and virulence of hypermucoviscosity-positive Klebsiella pneumoniae in mainland China. We detected 16 hypermucoviscosity-positive strains in 65 total clinical isolates (24.62%). We found that 68.75% (11/16) of the positive strains had K2 genotype and carried the rmpA and iucA genes. Multilocus sequence typing revealed 5 sequence types (STs): ST65 , ST23 , ST86 , ST412 , ST375 , whereas the remaining 4 isolates were defined as other STs. The order of the median lethal dose values for the ST types was ST23 (2.19 × 103 CFU/mouse) < ST86 (1.70 × 104 CFU/mouse) < ST65 (5.05 × 107 CFU/mouse) < the other STs (1.90 × 108 CFU/mouse). In conclusion, the K2 with ST65 carrying rmpA and iucA was the most predominant among the hypermucoviscosity-positive K. pneumoniae strains obtained from community-acquired infection cases in Harbin, North China. Sequence types are a valuable tool to predict the risk of K. pneumoniae infection.