There are three major types of tubercle bacilli that affect humans. The human type ( Mycobacterium tuberculosis ), first identified in 1882 by Robert Koch , is spread by people themselves. It is the most common one. The bovine type ( M. bovis ) is spread by infected cattle but is no longer a threat in areas where pasteurization of milk and the health of cattle are strictly supervised. The avian type ( M. avis ) is carried by infected birds but can occur in humans. The tubercle bacillus can live for a considerable period of time in air or dust. The most common means of acquiring the disease is by inhalation of respiratory droplets.
Sections in this article:
- Course of the Disease
- Diagnosis and Treatment
- Prevention of Tuberculosis
The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2012, Columbia University Press. All rights reserved.
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