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A member asked:
If you were going to have a bad reaction (not a positive reaction) to a tb test (under the skin) would it happen right away or can it take days?
A doctor has provided 1 answer
1 to 3 days: It can take 1 to 3 days to get to its worst. This is for some people that have reactions after they have a positive test. If you are referring to a type of allergic reaction, this usually be almost right away.
Answered 11/24/2016
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