Infectious Disease · Internal Medicine · 2 h ago
Five-biomarker Klebsiella definition identifies bloodstream infections with frequent abscess complications
A retrospective Japanese cohort of 207 Klebsiella pneumoniae bloodstream infections found abscesses in 61% of episodes meeting a five-biomarker hypervirulence definition, versus 13% of other episodes. Hypervirulent infections were also associated with longer hospitalization and antimicrobial treatment.
- Five-marker hypervirulent isolates accounted for 14% of bloodstream infection episodes.
- Abscesses occurred in 61% of hypervirulent versus 13% of classical infections.
- Hypervirulent infections were associated with longer hospitalization and antimicrobial treatment.
- Three hypervirulent isolates carried CTX-M extended-spectrum β-lactamase genes.
A single-center retrospective cohort study at Kameda Medical Center in Japan assessed whether a five-biomarker definition of hypervirulent Klebsiella pneumoniae (hvKp) identified bloodstream infections with distinct clinical features. Researchers analyzed 207 first episodes during 2022–2024, defining hvKp by PCR detection of rmpA, rmpA2, iucA, iroB, and peg-344. The primary outcome was imaging-confirmed abscess complications; secondary outcomes included hospitalization, antibiotic duration, and 30-day mortality.
Overall, 28 episodes (14%) met the hvKp definition. Abscesses occurred in 17/28 hvKp episodes (61%), compared with 23/179 classical K. pneumoniae episodes (13%). Median hospitalization was 28 versus 14 days, and median antimicrobial treatment duration was 43 versus 14 days. Nine of 10 sequence type 23 hvKp episodes involved abscesses. Whole-genome sequencing detected CTX-M–type extended-spectrum β-lactamase genes in three hvKp isolates, representing 11% of hvKp isolates and 1.4% of all episodes.
These findings support the five-marker definition as a means of identifying an abscess-prone subgroup and informing genomic surveillance. However, this observational, single-center study does not establish that biomarker-guided management improves outcomes: classification was assigned retrospectively and was unavailable to treating clinicians. The supplied text does not report mortality results or adjusted effect estimates. The journal labels the article an early release subject to revision.
Is this summary clinically accurate?
Help fellow clinicians: your rating sends inaccurate summaries straight to our editors.
Sign in to rate this summary →Source
Emerging Infectious Diseases: Five-Biomarker Definition for Hypervirulent Klebsiella pneumoniae Bloodstream Infection and Abscess Complications, Japan, 2022–2024 ↗This is an automated AI-condensed summary that has not yet been reviewed by an editor. Always consult the full item at the original source.