suscept

Etymology
Probably a.

Noun

 * 1)  A species which is capable of being infected or parasitized by another species.
 * As is self-evident given its name, humanity is a suscept for HIV.

Usage notes
is used only to refer to a species as a whole, but not to individual organisms that have been infected or parasitised. The term is used to describe either the species as a whole or specific organism that has been infected or parasitized.