Fig. 5

Age distribution of latent tuberculosis infection. Coloured discs should be interpreted as spheres (to increase the relative size of the smaller spheres), with the volume of the spheres being proportional to the following quantities: 2018 total population (grey), size of the LTBI pool in 2018 (green), and number of individuals currently infected in 2018 who will ever develop active TB (purple). The numbers surrounding each disc indicate the age categories represented. Note that LTBI prevalence is predicted to reach extremely high levels among the oldest age category, which is explained by the high historical intensity of transmission in these countries and by the fact that we do not incorporate LTBI clearance