Microbiology An elderly patient presented with fever, chest pain and dry cough. Sputum cultured on charcoal yeast medium, the most likely organism is: A H. influenzae B Moraxella catarrhalis C Legionella D Burkholderiacepacia 💡 Explanation An elderly patient presented with fever, chest pain and dry cough. Sputum cultured on charcoal yeast medium, the most likely organism is: ✓ Correct Answer: C. Legionella