Abstract
It is indeed true that the main mode of infection is by airborne tubercle bacilli and that pulmonary infection is, therefore, the most frequent. However, drainage from any focus of active tuberculosis can be a source of infection, and inhalation need not be the only way for the tubercle bacillus to gain entry in the human body. Ingested bacilli can create a primary focus in the intestinal tract, the tonsils, or the mucous membrane of the mouth. Tubercle bacilli that come in contact with broken skin can cause a primary complex of the skin; in pathologists performing postmortem examinations and butchers handling infected animal carcasses, the primary lesion was known to develop by direct inoculation. Urine of patients with renal tuberculosis is potentially infectious. Crowded home conditions and the presence of several very young children and an infant less than a year of age in the family are
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