An Assessment of Siderophore Production, Mucoviscosity, and Mouse Infection Models for Defining the Virulence Spectrum of Hypervirulent Klebsiella pneumoniae
| Autor: | Sidra Hassan, Patrick McGann, Ellie Camanzo, Brendan W. Corey, Thomas A. Russo, Ulrike MacDonald, Francois Lebreton |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Male
0301 basic medicine Siderophore mice Virulence Factors Klebsiella pneumoniae 030106 microbiology Virulence Biology Microbiology Cohort Studies 03 medical and health sciences Plasmid Animals infection model Molecular Biology Gene Mice Inbred BALB C siderophores Strain (biology) biology.organism_classification Phenotype QR1-502 hypervirulent pathogenic potential Klebsiella Infections Mice Inbred C57BL Disease Models Animal 030104 developmental biology mucoviscosity Bacteria Research Article Plasmids |
| Zdroj: | mSphere mSphere, Vol 6, Iss 2 (2021) |
| ISSN: | 2379-5042 |
| DOI: | 10.1128/msphere.00045-21 |
| Popis: | Hypervirulent Klebsiella pneumoniae (hvKp) bacteria are more virulent than classical K. pneumoniae (cKp) with resultant differences in clinical manifestations and management. It is unclear whether all hvKp isolates share a similar pathogenic potential. This report assessed the utility of siderophore production, mucoviscosity, and murine infection for defining the virulence spectrum of hvKp. Three strain cohorts were identified and defined based on the CD1 mouse subcutaneous (SQ) challenge model: (i) fully virulent hvKp strains (fvhvKp), lethal at a challenge inoculum (CI) of ≤103 CFU; (ii) partially virulent hvKp strains (pvhvKp), lethal at a CI of >103 to 107 CFU; (iii) classical K. pneumoniae, not lethal at a CI of 107 CFU. Quantitative siderophore and mucoviscosity assays differentiated fvhvKp and pvhvKp strains from cKp strains but were unable to differentiate between the fvhvKP and pvhvKP strain cohorts. However, SQ challenge of CD1 mice and intraperitoneal (IP) challenge of CD1 and BALB/c mice, but not C57BL/6 mice, were able to discriminate between an fvhvKp and a pvhvKp strain; SQ challenge of CD1 mice may have the greatest sensitivity. cKp was differentiated from hvKp both by SQ challenge of CD1 mice and IP challenge of all three mouse strains. These data identify a means to define the relative virulence of hvKP strains. It remains unclear whether the observed differences of hvKp virulence in mice translates to human infection. However, these data can be used to sort random collections of K. pneumoniae strains into fvhvKp and pvhvKp strain cohorts and assess for differences in clinical manifestations and outcomes. IMPORTANCE The pathogenic potential of hvKp strains is primarily mediated by a large virulence plasmid. The minimal set of genes required for the full expression of the hypervirulent phenotype is undefined. A number of reports describe hvKp strains possessing only a portion of the virulence plasmid; the clinical consequences of this are unclear. Therefore, the goal of this report was to determine whether virulence among hvKp strains varied and, if so, how to best identify the relative virulence of hvKp isolates. Data demonstrate hvKp pathogenic potential varies in CD1 and BALB/c murine infection models. In contrast, measurements of siderophore production and mucoviscosity were unable to discriminate the differences in hvKp isolate virulence observed in mice. This information can be used in future studies to determine the mechanisms responsible for differences between fully virulent hvKp and partially virulent hvKp and whether the differences observed in mice translate to disease in humans. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|