Globally, it's believed that about one-third of the population on the planet has a latent form of TB. That's obviously significantly lower in high-income countries, because if TB is controlled in a place like Canada, there will be many generations that have now grown up without TB in their environment. Their chances of being latently infected are much less, but if you're looking at places like Africa or Asia, a good one-third of the population is at risk of developing TB because they already have the bug in their body in a latent form.
On November 21st, 2017. See this statement in context.