[Fitness for child nurseries and exposure]

For one year in 245 children, aged from 6 to 36 months staying in 8 crêches of a large town, frequency and duration of acute respiratory disease (ARD) were registered. The exterior conditions of life were comprehended. From this material 10 risk factors were determined. By elaborating a score for prognosis it was possible to discriminate 2 classes of children. One part was susceptible, the other resistent to infections. This publication shall be a contribution for answering the question for crêche fitness after getting over an ARD.