Damon will not be getting sick, deathly or otherwise. But, he'll be around to puzzle about the situation and do some investigating. Maybe in the hospital. But, he'll help any close CR, and hopefully if the symptoms don't worsen, he won't do something stupid like offer or force his blood onto someone (again, with mod permission were this to ever even happen.) But, he'll mostly do the snooping thing. And the judgy thing.

And he will not be sympathetic to Katherine Salvatore Pierce.