These humans are NPCs and move around in an unpredictable manner.
You are small. Infect humans by moving to them and avoid doctors.
You are as big as humans. Kill coronavirus by moving to them. Avoid tuberculosis...they can kill you!
These dots can be eaten by both coronavirus and doctors. They give you more score.
You want the ratio to your majority. If you are cornavirus, the red represents you and you want that to cover more area of the circle than green (doctors). To do this, infect humans! If you are a doctor, catch coronavirus! However, both sides can help win it to their favor by eating the dots!
You do not want to contract tuberculosis! You will die if you are a doctor! Thankfully, they are very rare.