Klebsiella pneumoniae

1. GC 105 explicitly lists Klebsiella under Enterobacterales with disease associations: UTI, abdominal infections, diarrhoeal syndromes, and many others. It emphasises ESBL producers are "resistant to β-lactams except carbapenems" and CPE as an emerging resistance threat. ^[1] — This is the single highest-yield antibiotic resistance teaching point for Klebsiella in the exam.

2. GC 105 Expert Practice Tip 5: "If you have a patient with documented severe infection due to ESBL +ve Enterobacteriaceae, carbapenems are the antibiotic of choice." ^[1] — Expect an MCQ where you must pick meropenem/imipenem over ceftriaxone when ESBL is stated.

3. GC 101 Handouts mention Klebsiella granulomatis (causes granuloma inguinale / donovanosis) as a separate species diagnosed by Giemsa staining for Donovan bodies ^[10] — do NOT confuse with K. pneumoniae; this is a classic trap in STD questions.

4. AOS Microbiology material and Gen Clerk Microbiology Summary reinforce MALDI-TOF MS as the modern identification method for Enterobacterales species-level identification. ^[11]

5. Endogenous endophthalmitis: Ryan Ho Ophthalmology notes state Klebsiella pneumoniae accounts for 60% of endogenous bacterial endophthalmitis in East Asia, classically associated with liver abscess in uncontrolled DM. ^[7] — This is a classic minicase/SAQ vignette: DM patient → liver abscess → new eye pain/visual loss → emergency ophthalmology consult.

6. Encapsulated organism list for asplenic patients (from Maksim Surgery Notes): "Some Nasty Killers Have Some Capsule Protection" — S. pneumoniae, N. meningitidis, Klebsiella pneumoniae, H. influenzae, Salmonella typhi, Cryptococcus neoformans, P. aeruginosa. ^[4] — Examiners may ask which organisms pose risk post-splenectomy; Klebsiella is included.

• Klebsiella vs E. coli in UTI: Both are G−ve lactose-fermenting Enterobacterales. Klebsiella is non-motile, indole −ve, urease +ve; E. coli is motile, indole +ve, urease −ve. In uncomplicated UTI, E. coli dominates (~75–85%); Klebsiella ~6%. In complicated/nosocomial UTI, Klebsiella proportion rises.
• Klebsiella vs S. pneumoniae pneumonia: Both cause lobar consolidation with bulging fissure, but Klebsiella classically affects alcoholics/DM patients with "currant-jelly" (thick, blood-tinged, mucoid) sputum, typically upper lobe; S. pneumoniae is the commonest CAP organism overall with rusty sputum. Both are encapsulated.
• ESBL trap: If a vignette states the isolate is "ESBL-producing" or "resistant to 3rd-gen cephalosporins", the answer is carbapenem (meropenem/imipenem), NOT piperacillin-tazobactam (controversial, not reliable for severe infections).
• K. pneumoniae vs K. granulomatis: Completely different diseases. K. granulomatis causes donovanosis (genital ulcer with beefy-red granulation tissue, Donovan bodies on Giemsa stain) — an STD, not pneumonia/UTI.
• SBP organisms: G−ve (E. coli > Klebsiella) more common than G+ve. Monomicrobial growth expected; polymicrobial → think secondary bacterial peritonitis from surgical cause ^[8].

No specific past paper questions directly naming or centring on Klebsiella pneumoniae were identified in the indexed past paper stems from 2016–2025 Fourth Summative MCQ, SAQ, or Minicase papers. Klebsiella-relevant knowledge is most likely tested indirectly through:

• UTI microbiology stems (asking the 2nd commonest uropathogen)
• Antibiotic resistance questions (ESBL, carbapenem resistance)
• SBP management questions (empirical 3rd-gen cephalosporin)
• Liver abscess / endophthalmitis clinical vignettes

Students should be prepared to identify Klebsiella as the answer in any stem featuring: DM + liver abscess, mucoid G−ve rod, ESBL resistance pattern, or endogenous endophthalmitis in East Asia.