Results of tuberculin testing of 250 Navajo infants and children, vaccinated as newborns with Rosenthal BCG is reported. The incidence of strong reactors to 5 TU of PPD is very low after one year. It is suggested that tuberculin testing of BCG-vaccinated children as screening for tuberculosis, under the conditions outlined above, is both feasible and practical. Three cases of primary pulmonary tuberculosis so discovered are reported.

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