ABSTRACT
In the preantibiotic era, sun exposure and cod-liver oil were recognized treatments for tuberculosis (TB) (Table 13.1).1 In the 1920s, for example, pulmonary TB was treated routinely with graded sun exposure. No one knew exactly why it worked, except that many sick patients with TB sent to rest in sunny locales or in the mountains became free of the disease.2 With the advent of sulfonamides after the First World War, and the subsequent development of more effective antibiotics, these observations were neglected.
