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  • TB Infection Vs Active TB Disease

    Learning Objectives

    to bring our the difference between TB infection and active TB Disease. 

    The difference with respect to symptoms and x-ray changes, chances of spreading infection to others and need for treatment.



TB Infection Active TB Disease
May not have any signs & symptoms Has sign and symptoms such as cough for more than two weeks, fever, weight loss and blood in sputum
Bacteria are present in dormant state in the body Bacteria are active and multiplying in the body
Doesn't spread TB bacteria to others May spread TB bacteria to others
Chest X-ray usually normal Lesion in Chest X- ray (usually)
May advance to active TB. It is estimated that the lifetime risk of an individual with TB infection for progression to active TB is 5–10%. Needs treatment for TB disease


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