<prompt> A 60-year-old man is diagnosed to be suffering from Legionnaires disease after he returns home from attending a convention. He could have acquired itFrom a person suffering from the infection while travelling in the aeroplaneFrom a chronic carrier in the convention centerFrom inhalation of the aerosol in the air conditioned room at convention centerBy sharing an infected towel with a fellow delegate at the convention  <response>: Ans. is c i.e., From inhalation of the aerosol in the air conditioned room at convention centerRef: Harrison, 19the, p. 1014; Ananthanarayan, 9the, p. 401Legionella can multiply in free-living amoebas and can coexist with them in biofilms. Infection of debilitated or immunocompromised humans commonly follows inhalation of the bacteria from aerosols generated from contaminated air-conditioning systems, shower heads, and similar water sources. 