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Slide 131 Interventions for Tuberculosis Control and Elimination
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A similar indication for the protective effect from sensitization with environmental mycobacteria comes from the Karonga trial in Malawi. Here, the risk of tuberculosis during follow-up was smallest in persons with indurations from 6mm to 10mm, not as one might expect in persons with an initially negative reaction.
   
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Last update: September 29, 2010