![]() Some people develop TB disease soon after becoming infected (within weeks) before their immune system can fight the TB bacteria. Many people who have latent TB infection never develop TB disease. They may also be able to spread the bacteria to people they spend time with every day. When TB bacteria are active (multiplying in your body), this is called TB disease. There is usually a negligible risk of severe swelling and redness, particularly if you have had a PPD test and you’re having it redone.TB bacteria become active if the immune system can’t stop them from growing. ![]() He/she will check whether the area where you received the shot reacted to the PPD. You must go back to see your doctor after 2 or 3 days.
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