*Add in marauders, keep them infront of your marines and try to snipe them.
*Tanks focus firing infestors
*Also if zerg goes infestors that means he can't have mutas, so you can drop everywhere. Really abuse the drops, 3 places at once and he can only defend 1 or 2.
if he has them near some impasseble terrain , 2 banchees with cloak can easely kill off enough infestors to make it worth it, and it will cost a good deal of infestor energy to reveal and kill the 2 banchees. With bigger groups of banchees you risk losing more than it costs him . But you could try more than 1 group of 2 banchees.
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