- 6,879
- 3,771
Not sure. It's possible, since the DxD wiki said something about Issei and Saji getting sick but it was something specifically contracted(?) onto Devils.Wouldn't devils have Resistance to Disease manipulation too? I forgot which Volume it was but I believe it's stated that devils are immune to all human illness.
So maybe they can't get sick from human illnesses but those that Devils can be affected by would affect them the same way as ordinary ones do on us.