Location Transport

What is the risk of tuberculosis on public transport?

I am doing a project. What is the risk of public transport with the exposure time being less than: 1 hour on a train? 1 hour total time on a number of different underground tubes throughout the day? Any help would be appreciated.

Public Comments

1. The length of time doesn't matter. All it takes is one sick bastard to cough on you. You could've been there for just a second or over an hour, it doesn't matter.