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This doctor's dissertation in Danish presents the details of the author's experiments with light treatment of tuberculosis in guinea-pigs. The main outcome of the work may be summarized as follows: Universal irradiation (arc light) of hairless guinea-pigs increased the resistance to tuberculosis in animals that had been infected with small doses of tubercle bacilli or had been treated previously with the Calmette vaccine. This increase in resistance is ascribed to a special action as shown by the hastening of the specific allergic reactions; light treatment of healthy guinea-pigs that were infected later did not influence the course of the tuberculosis.
Undersøgelser af universelle Kulbuelysbades Indvirking paa experimentel Marsvinetuberkulose. JAMA. 1937;108(7):584. doi:10.1001/jama.1937.02780070068036