Well, this website attempts to show you how many people you could end up killing if you were patient zero of such a disease. It's called Collapse and uses Google Maps to work out your infection potential with key landmarks around you.
Living in a busy area in London, I ended up killing quite a lot of people. My favorite thing about Collapse though? When you share your results on Twitter, you tweet something like this, with no relation to the website, The Division or Ubisoft. IN ALL CAPS.
I CAUSED 665 461 403 DEATHS IN 23 DAYS
— Patrick Dane (@PatrickDane) February 24, 2016