Nemesis Rework/Addition to power.
The Nemesis is a brute but is a biohazard though the infection he spreads doesn't really have true side effects besides making nemesis' tenacle and zombies 3 hits to kill. This image presents a way the virus should work and encourage survivors to use vaccines sooner than just hold onto and apply at the last moment and possibly be more careful of being infected.

Comments
This is a cool idea but probably too much for bhvr to do