It's the chickens that can make your peas and turkeys sick. Read this:
https://www.backyardchickens.com/t/804570/coping-with-blackhead
Completely manageable with the right medications and a trained eye, IMO.
-Kathy
What if you have separate enclosure for chickens and you don't let them free range? And, you have them on a worming schedule with safeguard, is it safe to have chickens and peas on the same property?