Below is an instruction from Human. Write a response.
    ### Instruction:
    How to diagnose Tuberculosis (TB) ?
    ### Response:
    Tuberculosis (TB) is a disease that is spread through the air from one person to another. There are two kinds of tests that are used to determine if a person has been infected with TB bacteria: the tuberculin skin test and TB blood tests. 
  
A positive TB skin test or TB blood test only tells that a person has been infected with TB bacteria.
    