Koch's infx/TB: Tuberculosis just doesn't develop - you catch it from someone who is infected. It is only transmitted human to human, so you need to be exposed to someone who either has an active case or is a carrier. Many people worldwide are unaware they are infected, are asymptomatic carriers. That's why when someone is diagnosed with TB, everyone around them they've had contact with need to be evaluated.
Answered 10/4/2016
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