I recall getting one of these a while back, and I believe someone else discussed this as well some time ago. I could be wrong thought, but still interesting.
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Creator of the Star Trek Mod - AST Mod - 78 Ship Sets - Conquest Mod - Atrocities Star Wars Mod - Galaxy Reborn Mod - and Subterfuge Mod.
I think a couple of patches ago, any ship with a medical bay could cure a planet with a plague, even if it wasn't yours. That doesn't seem to work lately -- hey I was just helping out the AI on a mission of mercy. I had noting to do with that plague. Nothing at all. Quit stareing.
Wow, I didn't know this either. I set the events to low frequency catastrophic and some games nothing ever happens. So I've only had a plague event a couple times ever.