[Selected immunologic tests in industrial workers chronically exposed to harmful occupational factors]

160 workers, aged 19-60 (average 41.5 years), engaged in the production of prefabricated concrete elements and chronically exposed to ambient humidity and temperature fluctuations underwent preventive clinical immunological examinations. Eighty-seven subjects passed, within recent six months, upper respiratory tract infection. Forty-seven per cent of those who passed the respiratory tract infection exhibited enhanced immunological reaction of cellular type, ability of lymphocytes blastic transformation, the degree of lymphocytes immunoadherence inhibition in the presence of antigens, and lymphocytes B value. The changes in the circulatory system may be conditioned by chronic myocarditis.