Hypervirulence<<Return to Laboratory
Hypervirulent K. pneumoniae (hvKP), as opposed to ‘classical’ K. pneumoniae (cKP) can be distinguished by a combination of clinical and bacterial phenotypic features. These include the ability to establish infection in healthy host, unusual sites of infection, an ability for metastatic spread of the infection, and they often (but not always) present on an agar plate as hypermusocviscous which can be semi-quantitatively defined by a positive ‘string test’. The factor that mediates the expression of the hypermucoviscous phenotype is RmpA/RmpA2 (regulator of mucoid phenotype) encoded by 3 genes, chromosomally encoded rmpA and plasmid encoded p-rmpA and p-rmpA2. Studies have also shown that hvKP tend to fall within certain capsular serotypes often K1, but sometimes K2, K5, and a few others. Further hvKP strains have a high association with certain virulence factors that assist them in successful growth in their niche such as iron acquisition systems like the aerobactin operon. This test uses PCR to look for K1, K2, and K5-serotype specific genes, as well as the rmpA/rmpA2 genes and an aerobactin operon-specific gene.
- Urinary tract infection
Send cultures as growth on culture medium or in transport medium.
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Completed Antimicrobial Resistance and Nosocomial Infections Requisition.
PCR based method. Results compared to known standards.
6 calendar days.
- Zhang Y, C Zhao, Q Wang, X Wang, H Chen, H Li, F, Zhang, S Li, R Wang, H Wang. 2016. High prevalence of hypervirulent Klebsiella pneumoniae infection in China: geographic distribution, clinical characteristics and antimicrobial resistance. Antimicrob Agents Chemother doi:10.1128/AAC.01127-16.
- Turton, JF, H Baklan, LK siu, ME Kaufmann, TL Pitt. 2008. Evaluation of a multiplex PCR for detection of serotypes K1, K2, and K5 in Klebsiella sp. and comparison of isolates within these serotypes. FEMS Microbiol Lett 284:247-252.