...Wait... basically you asked if they have a strong immune system, correct? Sorry, it's just that I have a head ache and the spelling wasn't your usual...
Anyway... Predator live in jungle-type enviroments. Of course they would have developed very strong immune systems in their species over the years of evolution. In junge enviroments lay the six layers as well, so in addition to our own rain forest baddies, think of
their's.
That has strong written all over it.
So the fact that they have very strong immune systems is aside and most likely proven, I'd like to say that they even don't have some of our diseases. Their atmostphere is probably different, their climates are very different, and their lifeforms are different. Predators can be the lowest ranked of their humane society for all we know.
I know there's a chance their immune systems are strong, but that doesn't mean they're immune to everything.
"To me, everyone is crazy. The ones in The Mental House got caught."