05-31-2013 07:02 PM - edited 05-31-2013 07:03 PM
I'm pretty sure you can punch runners (first stage of infection) and stalkers (second stage of infection), but Clickers (third stage) and Bloaters (fourth stage), I'm not sure about, ND already said that if a Clicker touches you, you're infected and die, but they've said nothing about the Bloaters.
05-31-2013 07:11 PM
You can punch clickers. Though, not in a single run. They'll kill you.
However, if you punch 4 times, then throw a thing in their face, you can punch another 4 times, and that'll kill them.