4 how do you know if you have tb infection if you

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systems, the TB-infected persons will soon develop active TB disease. 4. How do you know if you have TB infection? If you have been in contact with someone diagnosed to have active pulmonary TB, you can be tested for TB infection. The recommended test for TB infection is the tuberculin skin test using the Mantoux method where the tuberculin (or PDD) is injected into the skin. This is read after 48 to 72 hours. The skin tests using the multiple-prong or prick devises are not recommended. Your doctor must read the skin test and if this is found to be positive, he must look for evidence of typical tissue damage caused by TB by ordering a chest x-ray. If your tuberculin skin test is positive but you have no symptoms and your chest x-ray is normal, then you have TB infection. If you have findings on chest x-ray compatible with Tb and your skin test is positive, then you have TB disease particularly if you have symptoms that suggest active pulmonary TB (see TB disease). 5. Is TB infection contagious? No. TB infection is not infectious to others. In TB infection, there has not been enough tissue damage (unlike in TB disease) to cause symptoms. A person with TB infection does not have bacteria in his or her lungs that can be coughed out into the air and infect others. 6. Does TB infection have to be treated? Not all persons with TB infection are given treatment by their physicians. Only one out of ten persons with TB infection will eventually develop TB disease (become sick with the symptoms of TB). Unfortunately it is impossible to identify which person who becomes TB infected will be the one who
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later develops TB disease. But it is possible to treat the person with TB infection with an anti-TB medication to eliminate the changes of developing TB disease. The medication used to treat infection (isoniazid or INH) can cause liver toxicity particularly in older individuals. This must be weighed against the benefit of treating TB infection (elimination of the 10% chance of developing TB disease).
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