A mod that adds The Plague, you can be infected by Fleas and Plague zombies. If you have The plague you can just drink milk, but be careful..while you have it you infect animals and player around you.
Added:
Plague Zombies
Fleas
The Plague
The plague work like poison, but it's more aggressive and you infect entities around you, the effect of The Plague won't go away if you don't drink milk or die
