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. 2017 Feb 8;7:41933. doi: 10.1038/srep41933

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The associations of QFT positivity with close contact with active TB patients and BMI ≥ 28.0 kg/m² were shown by study site as well. The strength of the association for close contact was strongest at the site with the lowest prevalence of infection. Inversely, the association of BMI ≥ 28.0 kg/m² was strongest for the site with the highest prevalence of infection.