At one level, the numbers look good, but if you look again, maybe not. Once upon a time, TB started out as something else, probably some environmental predecessor that lived in watery or other environments, perhaps starting out in another animal, but eventually, it got to humans. There was a ‘patient zero’ for TB, just as there is for all new and emergent pathogens, and for TB, it is guessed that this happened around 5,000 to 10,000 years ago. There is evidence that it has be