Tuberculosis is an infectious disease of humans and animals.
Humans got infected through drinking raw milk, but with the introduction of milk pasteurization this form of human tuberculosis has become very rare in the United States. Other mycobacteria that cause human diseases are very rare in people with healthy immune systems. Tuberculosis in humans is commonly seen as a lung infection or pneumonia. While infection of other organs such as the brain, bones, intestines, and kidneys also occurs, these are rare. Humans get infected by M. tuberculosis when they inhale the mycobacterium.