Not everyone with TB is infectious. Children with TB or people with a TB infection that occurs outside the lungs extrapulmonary TB do not spread the infection. But in some cases, the bacteria infect the body but do not cause any symptoms latent TB , or the infection begins to cause symptoms within weeks, months or even years active TB.
This usually happens either within the first year or two of infection, or when the immune system is weakened — for example, if someone is having chemotherapy treatment for cancer. Page last reviewed: 12 November Next review due: 12 November Senescent intimal foam cells are deleterious at all stages of atherosclerosis.
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If you test positive for latent TB infection, your doctor might advise you to take medications to reduce your risk of developing active tuberculosis. Only active TB is contagious.
If you have active TB , it generally takes a few weeks of treatment with TB medications before you're not contagious anymore. Follow these tips to help keep your friends and family from getting sick:.
This is the most important step you can take to protect yourself and others from tuberculosis. When you stop treatment early or skip doses, TB bacteria have a chance to develop mutations that allow them to survive the most potent TB drugs. The resulting drug-resistant strains are deadlier and more difficult to treat. In countries where tuberculosis is more common, infants often are vaccinated with bacille Calmette-Guerin BCG vaccine. The BCG vaccine isn't recommended for general use in the United States because it isn't very effective in adults.
Dozens of new TB vaccines are in various stages of development and testing. Mayo Clinic does not endorse companies or products. Advertising revenue supports our not-for-profit mission.
This content does not have an English version. This content does not have an Arabic version. Overview Tuberculosis TB is a potentially serious infectious disease that mainly affects the lungs.
Request an Appointment at Mayo Clinic. Share on: Facebook Twitter. Show references Basic TB facts. Centers for Disease Control and Prevention.
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