[An epidemiological investigation of an outbreak of Legionnaires' disease in a college in Tang Shan].

An outbreak of Legionnaires' Disease (LD) in a college in Tang Shan in the winter of 1987 was reported. Indirect fluorescent assay (IFA) for the antibodies against Legionella Pneumophila (Lp) serogroups I, VI and VIII was carried out in 52 students and 6 teachers. It was found that the antibody titer of LP VI greater than or equal to 1:256 was in 12 students. The clinical figures of these patients were classified into three types: pneumonia 3, fever 9 and asymptomatic 1. It was postulated that the outbreak was associated with water contamination of the college bathroom. There were more patients in two dormitories than in the others, which was suggested that the possibility of a spread of the disease from a person to the others.