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If your reaction to the second test is negative, you probably do not have TB infection.TB blood tests use a blood sample to find out if you are infected with TB bacteria.However, in some people, BCG may cause a positive skin test when they are not infected with TB bacteria.A positive reaction is more likely to mean you have been infected with TB bacteria if: Many people who have latent TB infection never develop TB disease.

This is because it can take several weeks after infection for your immune system to react to the TB skin test.

A positive reaction usually means that you have been infected by someone with TB disease.

If you have recently been infected with TB bacteria, your TB skin test reaction may not be positive yet.

The preferred regimen for children 2-11 years old is 9 months of daily INH.

Another effective treatment option for people with latent TB infection is the 12-dose regimen.

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