[Jmenschenfresser]

I think you could simplify the math a little on the curing part if you gave the medical bays a cure rate.

And give plagues an infection rate.

So someone drops a lvl 1 plague bomb on your planet. It starts at 10% plagued and increases at a rate of 1% per turn. Something like that.

You then move a lvl 1 medical bay over the planet. It has a reduction rate of 2%. The percentages are then just treated like simple integers, and you arrive at a reduction rate of -1%. And you could make medical bays stack to cure plagues faster.

I'm not actually sure how you'd figure deaths, because a 10% plague will reduce your population quickly if you figure 10% dying every turn. I guess theoretically you can never get to zero population.

Dunno, just suggestions.