Source of TB infection
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Microbiologically confirmed pulmonary Tuberculosis (TB), is the most common and infectious form of tuberculosis and forms the major source of infection in the community.
Every sputum smear-positive patient has the potential to spread the infection to 10 – 15 persons annually, if untreated.
An infectious TB patient becomes a source of infection for all close contacts (household members, workplace coworkers, students studying in the same class or people coming in close contact with such a case).


