Stalker

Stalkers are the second stage the infected host takes form of. These Infected are, in my opinion, the most deadly. They are half Runner and half Clicker. They chase after you before a Runner can even detect you. They tend to use flanking maneuvers and attack from behind. You

Stalker
can kill them the same ways you kill Runners. Stalkers tend to stay around dark areas and sometimes travel in groups. Stalkers are most like humans when they attack. Use Joel's listening skill to find out where these Infected are but make sure they aren't sneaking up on you while you listen.