The skin test reaction should be read between 48 and 72 hours after administration. You can wash your arm and dry it gently.If the spot itches, put a cold cloth on it.Be careful not to rub it or scratch it.
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This phase can last for a very long time – even many years. Anyone can get TB because it spreads from one person to another through the air. Without treatment, latent TB infection can become active TB disease. When TB germs first enter your body, they cause latent TB infection. Both phases can be treated with medicine. Additional tests, such as AFB testing, are required to help establish a diagnosis of an active TB infection. tuberculosis infections, but neither can distinguish between latent and active infections. Active TB does cause illness and can be passed to others through respiratory secretions such as sputum or aerosols released by coughing, sneezing, laughing, talking, singing, or breathing.īoth the tuberculin skin test and the IGRA blood test can detect M.
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If, after some time, the immune system of an individual with an inactive infection becomes weakened (compromised), the mycobacteria may begin to grow again, leading to an active case of tuberculosis disease. The person does not have any symptoms and is not infectious but does have a “latent TB infection.” The bacteria in these cells are inactive but still alive.
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The immune system of about 90% of people who become infected with TB manages to control its growth and confine the TB infection to a few cells in the body. TB may cause an inactive (latent) infection or an active, progressive disease. The screening tests measure the body’s immune response to antigens derived from these bacteria, either directly as a skin reaction to a tuberculin skin test (TST) or indirectly with an interferon gamma release assay (IGRA) blood test. tuberculosis infection in an individual and is used in the diagnosis of TB in individual patients, as well as in epidemiological settings, to measure the prevalence of tuberculous infection in populations. Short of demonstrating viable organisms in body tissues and fluids the tuberculin skin test (TST) is the only method of detecting M. A combination of factors including high costs, limited resources and the poor performance of various diagnostic tests make the diagnosis of TB difficult in developing countries. Tuberculosis (TB) remains a leading cause of morbidity and mortality in the world, especially in developing countries.