Sputum Culture Normal Flora COPD — SCE Infectious Diseases MCQ

Correct answer: A — Do not treat “mixed flora” as proof against bacterial exacerbation; continue to base treatment and reassessment on clinical response and valid susceptibility results after review with follow-up clinically-reassessed

The best answer is “Do not treat “mixed flora” as proof against bacterial exacerbation; continue to base treatment and reassessment on clinical response and valid susceptibility results after review with follow-up clinically-reassessed”. Expectorated samples are vulnerable to upper-airway contamination; a non-specific result must be interpreted with the clinical syndrome rather than used as an automatic stop or escalation rule. “Escalate automatically to meropenem because no pathogen was isolated” is less appropriate because it does not satisfy the scenario's decisive clinical or jurisdictional requirement. “Stop treatment immediately because mixed flora excludes lower-airway infection” is less appropriate because it does not satisfy the scenario's decisive clinical or jurisdictional requirement. “Add an antifungal because bacterial culture was non-diagnostic” is less appropriate because it does not satisfy the scenario's decisive clinical or jurisdictional requirement. “Repeat sputum culture every day until a single organism grows” is less appropriate because it does not satisfy the scenario's decisive clinical or jurisdictional requirement.

Reference: NICE NG114 acute COPD exacerbation antimicrobial prescribing: https://www.nice.org.uk/guidance/ng114/chapter/Recommendations