It would be nice to be able to infect a your own colony or NPC colony with zombie strain. The downside to this is that the zombies can travel the world, attack, and infect more pawns at will if not contained within the area you used it in. Meaning that you have to wipe out all zombies on that map. Even those that got bit (friendly/enemy) and left the map can convert and spread. This will lead to the zombies having their own population count which can increase with each pawn converting and can decrease from player and NPC factions actions. They are fast deadly and can infect a pawn from 1 bite. They can even ambush your caravans. The game can also give you a mission to attack zombie hideouts in an attempt to lower their count.

Just an Idea