I have had screening for TB for several different jobs that I've had. I have had the skin test, where they prick you with something and then you have to come back a few days later for them to "read" it. I think the idea is that if you have TB (presumably even dormant) then you develop some sort of reaction, like the article talks about.
But there was never a reason to think that I would have TB. So what I'm wondering is how often it actually finds anything. Does the test really work for preventing the spread of TB?