Down with the sickness (nice name btw) has an effect that is really well thought out! Makes total sense why some factions would really care about having their warriors able to move and battle. Seems like it would be tough on moles but soft on lizards and cats. (GOOD)
Sorry I'm sure I'm missing it somewhere, but how can you tell if a certain warrior is infected? I believe it's using the virus markers yeah? Maybe it would be some great flavour if they were laid down on their side :P just a thought
Your two ways of scoring VP and the balance you need to have with both is brilliant! You really can see and feel the push and pull between having clearings be endemic with the infection, then offering them the cures to also score VP. Really sweet!
I also really love you using the dice to take extra actions other than battling, that's definitely some design space you don't often see used! And I'm glad to see all sorts of now pieces and cards being put to good use as well.
Very creative, and I hope to see them developed even more
later!