TB is vastly underestimated here in the US where we have largely eliminated it, but it is indeed the deadliest infectious disease known to man. It killed 1.25 million people in 2023.
This is nitpicking, but I guess which disease bears the title depends on how you define it. I remember seeing some estimate that malaria has killed ~40% of all humans that have ever lived.
where did you get that?
it seems like Ebola Zaire, Marburg, and sundry other diseases are saying "hold my beer".