There is an increase in staphylococcal respiratory infections in the ICU. The intensivist recommends ordering respiratory cultures for all patients to treat positive cultures in the absence of infection. What is this an example of?

• A. Antimicrobial misuse
• B. Nosocomial outbreak
• C. Antimicrobial stewardship
• D. Diagnostic overuse

Answer: (A)

The situation shows antimicrobial misuse: antibiotics are being started based on colonization detected by culture rather than a real infection. Staphylococcal colonization in the respiratory tract does not equal pneumonia or infection, so treating all positive cultures with antibiotics exposes patients to unnecessary drug effects, costs, and harms such as adverse events and promoting resistance. This undermines patient safety and stewardship goals, which aim to use antibiotics only when there is clear infection and to tailor or stop therapy as quickly as possible. It’s not describing a nosocomial outbreak, and while excessive testing can be problematic, the key issue here is the inappropriate antibiotic use driven by treating colonization rather than infection.