If I remember correctly, zombies were firstly thought as people who came back from the dead, not infected. I might be wrong.
I do consider L4D "zombies" as zombies, although the 28 days later ones didn't seem as the real thing to me..now that I think of it, I have no idea why, they seem to be the exact same thing.
I do consider L4D "zombies" as zombies, although the 28 days later ones didn't seem as the real thing to me..now that I think of it, I have no idea why, they seem to be the exact same thing.