<prompt> An elderly patient presented with fever, chest pain and dry cough. Sputum cultured on charcoal yeast medium, the most likely organism is:H. influenzaeMoraxella catarrhalisLegionellaBurkholderiacepacia  <response>: Ans. is c i.e., Legionella.Ref: Harrison, 19the, p. 1014; Ananthanarayan, 9the, p. 401Clinical features of legionella infection Legionnaire disease is very similar to other types of pneumonia lung infection, with symptoms that include - Diarrhea, High grade fever, Cough, Shortness of breath, Muscle aches, Headaches.Its a triad of Pneumonia, diarrhea and encephalitis 