• A bacteria that frequently causes lung, urinary tract, intestinal, and wound infections.
  NCI Dictionary of Cancer Terms
  U.S. National Cancer Institute, 2021
• A genus of gram-negative, facultatively anaerobic, rod-shaped bacteria whose organisms arrange singly, in pairs, or short chains. This genus is commonly found in the intestinal tract and is an opportunistic pathogen that can give rise to bacteremia, pneumonia, urinary tract and several other types of human infection.
  NLM Medical Subject Headings
  U.S. National Library of Medicine, 2025
• A genus of Gram-negative, non-motile, rod-shaped bacteria that have a polysaccharide-based capsule and are oxidase negative. Klebsiella spp. are frequent human pathogens.
  NCI
  U.S. National Cancer Institute, 2021
• Any bacteria that is not assigned to the species level but can be assigned to the Klebsiella genus level.
  CDISC Terminology
  Clinical Data Interchange Standards Consortium (CDISC), 2021
• Genus of gram negative, facultatively anaerobic, rod shaped bacteria whose organisms arrange singly, in pairs, or short chains; this genus is commonly found in the intestinal tract and is an opportunistic pathogen that can give rise to bacteremia, pneumonia, urinary tract and several other types of human infection.
  CRISP Thesaurus
  National Institutes of Health, 2006