Every year about a hundred young women begin a three year course in the nurses' training school at Ullevaal in the Municipal Hospital of Oslo. While in training, some of these young women contract tuberculosis in its different forms. To ascertain whether or not this disease was more frequent among the pupil nurses than among people in other environments, my chief, Dr. Olaf Scheel, in 1924, began making Pirquet's tuberculin cutaneous tests on these nurses. Since then the investigation has continued, and this report is the result of this and other researches which have followed. The report will be divided into three parts in which the following facts will be considered: (1) the number of nurses with positive and the number with a negative reaction to the Pirquet test on entering the school; (2) the number and the classification of nurses contracting tuberculosis. (3) Can we prevent tuberculosis among nurses?