Klebsiella pneumoniae is particularly associated with pneumonia in which populations?

• A. Patients with diabetes or alcoholism and those in hospitals
• B. Children with asthma
• C. Young healthy adults
• D. Immunocompetent elderly

Answer: (B)

Klebsiella pneumoniae pneumonia is most strongly associated with hosts who have impaired defenses or hospital exposure. Its thick capsule helps it resist phagocytosis, and alcohol use and diabetes further compromise mucosal defenses and clearance, making aspiration of colonizing organisms more likely. In the hospital or long-term care settings, debilitated patients are at increased risk for nosocomial pneumonia caused by Klebsiella. Because of these factors, the classic population includes individuals with diabetes or alcoholism and those in healthcare facilities.

In contrast, children with asthma and young healthy adults are more often affected by other pathogens (viruses in kids, Streptococcus pneumoniae or atypicals in healthy adults), and while elderly individuals can develop pneumonia, Klebsiella is not as specifically linked to immunocompetent elders as it is to those with diabetes, alcoholism, or hospital exposure.