Worse: TB is a bacterium - not a virus. A virus survives for minutes outside a host. You're prefectly safe in a classroom the day after there were 30 infected c

Worse: TB is a bacterium - not a virus. A virus survives for minutes outside a host. You're prefectly safe in a classroom the day after there were 30 infected children playing in the room. A bacterium survives for months (outside of direct UV light). You must not just stay away from infected people. You should never go anywhere an infected person HAS BEEN in the last few months, with the potential exception of open air spaces. We wouldn't have face masks. We'd be back to deporting infected people to remote islands to die. Technically there is a cure for TB: cutting up people's lungs. The individual bacteria grow so large there's a decent success rate for literally cutting them out one-by-one ... obviously it does not exactly restore your previous life expectancy, and it's not a guarantee.