if your poor and a cheap bastard, get some incinarary ammo. this is like in the first day sof th egame. the only thing you can really do is shoot them. also, a known tactic is to have each man carry a primed nade so if he gets infected he explodes. if your approaching something, or going around a corner, try to have the guys with quick reaction sup first, because if a chyrssalad sees you he will run towards you, and they usually get very very close before they run out of tu's