Objective To investigate the contamination of legionella in public places and to detect the situation of legionella infection in employees. Methods Samples were collected from different types of environmental media in shopping malls and hotels for legionella detection. Serum antibody and urine antigen for legionella were detected in employees. Results The positive rate for legionella detected from central air conditioning system( air from the outlet,the dust in wind tube and the water in cooling tower),wate...