Sylvatic:
Sylvatic is a scientific term referring to diseases or pathogens affecting only wild (sylvan means forest-dwelling) animals. [Wikipedia]
Seen on Discover’s Body Horrors blog:
Pigs, rats, and dogs are the beasts most commonly implicated as hosts in the domestic sphere, but more exotic animals such as wild boar, walrus, and polar bear may also serve in the sylvatic or wild animal cycle of Trichinella.