This can be merged with other threads discussing if Lee was bitten or not and whether he will survive, if the moderators feel it necessary.
Odds are that Lee is bitten, given everything we saw. However, I did notice that Lee's watch was broken on the arm he was attacked on. Could it be possible that the walker bit his watch and the broken glass of it is what cut Lee's arm? If so, it could mean Lee is going to be okay.