About DNA Points
The DNA points you receive as the game progresses changes depending on where you are in the game, they are not given at regular intervals, except when you infect a new country, in which case you will always get a red bubble.
If you look closely at the initial stages of a game you get more DNA points for infecting people than later in the game; if it was constant, you would end up with so many DNA points that it would be impossible to lose. The same is true the other way around: if it was proportional, there wouldn't be any DNA points for the first 20 minutes of the game, which would make it unplayable.
Part of the challenge is to manage the DNA points you receive. Also, as you infect the whole world, you start getting DNA points from killing the infected.
Thank you for playing!