Tuberculosis is one of the most wide spread contagious diseases, but it is certainly not all people who catch tuberculosis. Many people experience their first tubercular infection without even knowing it and never really become ill with tuberculosis for their entire lives. In an environment that is contaminated with tuberculosis, the disease is more likely to spread than elsewhere. That is why doctors, nurses, male nurses and domestic employees, who must take care of patients with open tuberculosis are particularly endangered. But here again, only a certain percentage of these people contracts tuberculosis. Certain special factors determine whether and how a person contracts tuberculosis. Heredity, the shape of the body, the way of life, certain weakening circumstances, the age, the threat of exposure, and the number and toxicity of the viruses as well as other facts assume increasing importance. Author
Trans. of Therapiewoche (West Germany) v6 p188-194 1956.