CD4 and tuberculosis: Our rate of conversion (9.2%) may be explained by three mechanisms: (i) new TB infections; Previously reported QFT-GIT conversion rates in HIV-negative health workers living in countries with high TB prevalence were of similar magnitude [38], [39], [40]; (ii) false negative tests becoming truly positive after immune restoration [41] However, in our study the absence of association between conversion and ART or CD4 gain is not in favor of this hypothesis; (iii) intra-individual variability of the test.