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Slide 031 Epidemiologic Basis of Tuberculosis Control
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Proper training of tuberculin skin test readers is essential to reduce the frequency of digit preferences as shown above in an extreme case, where digits 10, 15, 20, 25, 30, and 35 mm are given preference.  Such errors in reading may preclude a proper interpretation of the findings.
   
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Last update: September 10, 2010