Apparently you haven't seen 28 Days/weeks later..
Weren't the Infected in
28 Days/Weeks Later technically still alive? At least the ones that weren't mauled or bitten to death in the process of contracting the
Rage Virus, anyway. They supposedly starved to death before the story of
28 Weeks Later began.
Seigneur Master Chief, would you happen to remember if there was a zombie in the original
Night Of The Living Dead that was able to run after a car and another zombie that used a rock to smash the headlights of a pickup truck? After
Night, all of
George Romero's
Dead movies went with the slow, shambling zombies.