What is the TB skin test?
The TB skin test is performed by injecting a small amount of testing liquid into the skin of the forearm. The test needs to be read 48 to 72 hours later by someone trained in reading skin tests. If it's positive then a chest x-ray is done to rule out active disease. If the chest x-ray is normal then the person is likely to have TB infection. Once a skin test is positive it will most likely stay positive and should not be repeated. Unless a person develops symptoms one chest x-ray is all that's needed.

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1. What is TB?
2. How is TB spread?
3. What are the signs and symptoms of TB?
4. How do you treat active TB?
5. What is TB infection and how do you treat it?
6. What is the difference between TB infection and TB disease?
7. What is the TB skin test?
8. How important is TB today?