Questions and Answers About TB
Questions and Answers About Tuberculosis (TB) was written to provide information on the diagnosis and treatment of TB infection and TB disease for persons who do not have a medical background. Key audiences for this booklet are persons with or at risk for TB; persons who provide services for those at high risk for TB such as correctional officers, homeless shelter workers, emergency responders; persons who may have been exposed to someone with TB in a workplace or school setting; and persons who want to learn more about this disease.
- Should I get tested for TB?
- What are the tests for TB infection?
- What if I have a positive test for TB infection?
- What if I have been vaccinated with BCG?
- If I have latent TB infection, how can I keep from developing TB disease?
- What if I have HIV infection?
- If I was exposed to someone with TB disease, can I give TB to others?
- How is TB disease treated?
- What are the side effects of TB disease medicines?
- Why do I need to take TB medicines regularly?
- What is directly observed therapy (DOT)?
- How can I remember to take my TB medicines if I am not on DOT?
- How can I keep from spreading TB?
- What is the multidrug-resistant TB and extensively drug-resistant TB?
BCG– a vaccine for TB named after the French scientists who developed it, Calmette and Guérin. BCG is rarely used in the United States, but it is often given to infants and small children in other countries where TB is common.
Chest x-ray – a picture of the inside of your chest. A chest x-ray is made by exposing a film to x-rays that pass through the chest. A doctor can look at this film to see whether TB bacteria have damaged the lungs.
Directly observed therapy (DOT) – a way of helping patients take their medicine for TB. If you get DOT, you will meet with a health care worker every day or several times a week. You will meet at a place you both agree on. This can be the TB clinic, your home or work, or any other convenient location. You will take your medicine while the health care worker watches.
HIV infection – infection with the human immunodeficiency virus, the virus that causes AIDS (acquired immunodeficiency syndrome). A person with both latent TB infection and HIV infection is at very high risk for developing TB disease.
Latent TB infection – a condition in which TB bacteria are alive but inactive in the body. People with latent TB infection have no symptoms, don’t feel sick, can’t spread TB to others, and usually have a positive skin test reaction. But they may develop TB disease if they do not receive treatment for latent TB infection.
Smear – a test to see whether there are TB bacteria in your phlegm. To do this test, lab workers smear the phlegm on a glass slide, stain the slide with a special stain, and look for any TB bacteria on the slide. This test usually takes 1 day to get the results.
TB blood test – a new test that uses a blood sample to find out if you are infected with TB bacteria. The test measures the response to TB proteins when they are mixed with a small amount of blood. Examples of these TB blood tests include QuantiFERON®-TB Gold In-tube (QFT-GIT) and T-Spot®.TB test.
TB disease – an illness in which TB bacteria are multiplying and attacking a part of the body, usually the lungs. The symptoms of TB disease include weakness, weight loss, fever, no appetite, chills, and sweating at night. Other symptoms of TB disease depend on where in the body the bacteria are growing. If TB disease is in the lungs (pulmonary TB), the symptoms may include a bad cough, pain in the chest, and coughing up blood. A person with TB disease may be infectious and spread TB bacteria to others.
TB skin test – a test that is often used to find out if you are infected with TB bacteria. A liquid called tuberculin is injected under the skin on the lower part of your arm. If you have a positive reaction to this test, you probably have TB infection. Other tests will be needed to find out if you have latent TB infection or TB disease.
Tuberculin or PPD – a liquid that is injected under the skin on the lower part of your arm during a TB skin test. If you have latent TB infection, you will probably have a positive reaction to the tuberculin.