[3 successive radiophotographic surveys in a rural territory]

Three detections, carried out over a period of two years gave the following results: a high rate was obtained in the first one while the following two gave lower rates, in parallel with a decrease of the overall incidence through pulmonary tuberculosis from 326.70/0000 in 1968 to 1440/0000 in 1973. The cases were recently detected, during the last two investigations, which allowed for a wider application of the ambulatory treatment, a fact that compensated from the financial view point the cost of radiophotographic investigations. The authors suggest the maintenance of integral detection, with the same periodicity in the rural environment.