What does that flag below the character's portrait do?
Does it open a new tab that shows the disease overview? Or is simply an indicator that the disease is present / character is infected?
Any chance there may be some interplay between depopulation and culture conversion rates?
Is it possible to have more than one disease ravaging a province, or does the game prioritize them in some way?
Does England's smallpox make the country immune to the plague?
Depopulation when there's no population mechanic in the game doesn't make sense.
while it's possible for the Plague to come from central asia and bypass India, in this instance it arrived in the North-east of the subcontinent and spread throughout it and outwards. Meanwhile, England has Smallpox.