![]() The illness was known in England and France as "king's evil", and it was widely believed that persons affected could heal after a royal touch. In the Middle Ages, scrofula, a disease affecting cervical lymph nodes, was described as a new clinical form of TB. It has been hypothesized that the genus Mycobacterium originated more than 150 million years ago. Tuberculosis (TB) is a contagious, infectious disease, due to Mycobacterium tuberculosis (MT) that has always been a permanent challenge over the course of human history, because of its severe social implications.
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