Fig. 3From: The plasma kynurenine-to-tryptophan ratio as a biomarker of tuberculosis disease in people living with HIV on antiretroviral therapy: an exploratory nested case–control studyConcentrations of tryptophan and kynurenine metabolites in plasma from TB patients and controls at each visit. The bars represent the median with error bars indicating 95% confidence interval. The Y axis scale differs between the metabolitesBack to article page