| The
Tuberculin Skin Test (TST) |
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| • | Some 2-12 wks
after infection with M. tb, there is |
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| a delayed-type
hypersensitivity (DTH) reaction |
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| at the site of
tuberculin injection |
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| • | DTH reactions
begin 5-6 hrs after injection and |
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| reach a
maximum at 48-72 hrs |
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| • | Since the
1930s, TST has been used to screen |
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| persons or
populations for LTBI |
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