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Why are there different sets of TB Technical Instructions?

April 26, 2017different instructions TB Technical

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Why are there different sets of TB Technical Instructions?

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The original TB Technical Instructions developed in 1991 were based on the best screening tests and treatment known at that time. The TB Technical Instructions were updated in 2007 to use newer, more precise tests to reduce the chance of bringing TB into the United States and improve the health of immigrants and refugees through earlier diagnosis and updated methods of treatment.