My friend and I are playing on P2P server that I'm hosting (build 40.43).
He has been bitten by a zombie and it has been 10 in-game days and the wound still hasn't healed.
It doesn't say 'Bitten' anymore but the bleeding effect is still there and won't go away, the bandage on it goes dirty on regular basis, but even when he leaves it on for longer, he still doesn't develop infection there.