Just listening to the video Kings and Generals put out for EUV
>Many historians believe that one of the main bulwarks against the spread of the disease [Black Death] in Poland was its thriving Jewish community. Whereas Jews were scapegoated in Europe, they found sanctuary among the Poles, and the religious customs of ritual hygiene helped stymie the spread of germs in the Kingdom.
Jewish pops should now have extra resistance against the plague and they should spread their resistance to all the friendly gross goyim pops in your kingdom