It's not stupid at all. Britain isn't a third world country. In developing countries, such as in parts of Asia or Africa, the rate and spread of Tuberculosis is high because there is no proper health system or combative measures which prevent people contracting Tuberculosis in the first place. We have an advanced health system (in comparison to other countries) and not only is the likelihood of contracting TB very small, but the treatment for it is significantly better than it was a few years ago. To treat Tuberculosis usually requires an intensive and rather lengthy course of antibiotics but in recent years the length of treatment has been cut by a few months.

As you said, especially in Britain, the rate and spread of Tuberculosis is decreasing but that doesn't neccessarily mean it's on the increase. If something is decreasing then it's decreasing. You're argument about people not being immune to it is pretty much defunct because the chances of them contracting Tuberculosis is almost zero, and the unlucky ones who do can be treated.

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