You've made a gross error of judgment in posting that statement.
Firstly, you have no reason to think that I was, or am, worrying.
Secondly, even if I was worrying, it is not your place to tell me whether or not I need to worry. In fact, your statement is enough to make me worry, since it immediately introduces the idea (a) that there is something to worry about, and (b) that you, with no personal knowledge of me, or my family, or my living conditions, or my working conditions, purport to understand and quantify, in relative terms, the risks to me personally.
TB is quite hard to get. You get it from inhaling aerosols containing large numbers of the bacteria which are produced by infected people coughing (not from drains!).
You seem to have focussed on drains. I wonder why that is. Perhaps you find drains, as a source of TB infection, easy to dismiss, but in doing so you're ignoring a rather significant part of my question.
So unless you are working for prolonged periods (weeks) in poorly ventilated places, in cramped circumstances with people who are likely to have TB (and are currently coughing) like prisons or for intra-venous dug users/AIDS patients you have very little chance of getting it.
How interesting. How then, do you explain the fact that I know two people, both close friends, one of them a partner with whom I lived, who had TB a number of years ago, without encountering the conditions that you've just defined?
Don't bother to answer - I think I know. It's because you don't actually know the risks, and you're attempting to appear impressive. Well, I'm the opposite of impressed.
And even if you did catch it chances are you'd never know.
OK then. Please quantity the chances of knowing.
Furthermore almost all strains are treatable.
Please quantify "almost".
I think the WHO estimates that about 50% of the worlds population have been infected by TB at some point.
Please provide a reference to a document in which this "about 50%" is published.
Legionaires disease is however caught by inhaling aerosols from water sources (e.g. showers). The bug, legionella pneumophilia...<bla bla>
Did I ask about Legionnaires Disease?
No.
I didn't.
So please create a new topic if you want to spout about things other than TB.
Nice to see a question I know the answer to for once
I'll be the judge of that.