How does scoring work in Plague Inc on PC?

What determines how many Biohazards you get for a playthrough or a scenario in Plague Inc on PC? How does scoring exactly work?

Solution 1:

According to http://icspicy.blogspot.com/2014/05/plague-inc-black-death-scenario-mega.html:

In order to get a 3 biohazard score in mega-brutal, you'll have to finish within about 350-360 days with a cure completion of less than 60%.

According to http://steamcommunity.com/app/246620/discussions/0/558754260052055707/:

You earn 3 Biohazards with at least these victory-parameters:

According to How to get 5 biohazards?:

Score is based on several factors but the two main factors are the final cure percentage and the difficulty level.