From what I gather about the movie (and all zombie movies) is a person turned into a zombie when he or she is biten or consumes the blood or spit of the dead. So how did Mary get infected? When she's in the winnebago,her drivers window is shut so the cop zombie couldn't attack her,the hospital zombies did attack her so how did she turn?
I know I was reading on this forum that all the dead in Romero films come back to life bitten or not but if thats true then in 2004 dawn of the dead, Norma (the older trucker lady) and Andre( the young man with the pregnant gf/wife.) did not die from zombie bite or a shot to the head (shots to the chest killed them both) yet they never returned from the dead. Maybe Romero forgot about that
The Dawn of the Dead Remake is not canon in the Dead universe. The zombies in the Dead universe are like the ones in The Walking Dead no matter how you die the body will always reanimate.
This was a Romero "Dead" and is based on the original rules in NotLD. It was some sort of "high level radiation" that was the supposed culprit in that one so anyone that died for any reason, including previously dead and autopsied bodies, buried bodies etc all reanimated. A bite causes death through some sort of infection, but the infection wasn't apparently what reanimated the corpses of the dead.
This movie stunk so bad, btw, that there's still a stench floating around the room an hour later.
It's not a reboot, though. It's a separate story, set within the same fictional universe as all of romero's other dead films. Somewhere, not terribly far from where this film begins ben and barbara and company are trapped in a secluded farmhouse...
"Cinema was made for fantasy, rather than normal types of stories." - Ray Harryhausen