Zulu

"'Yeah, now that you mention it... nobody ever knew what they were dealing with - the dead would rise up and try to eat them, and they'd all be like -- 'What the fuck!' Whereas anyone not totally cut off from pop culture would be like, 'Zombies! Shoot 'em in the head!' Oh yeah, and they always had some other name for them - like 'walkers' or 'infected'...'""Juice turned to look at Pred sideways '...or Zulus'?'""Predator chewed on that for a second. 'Good Point.'" Zu-lu 

us - zooː.loo

uk - zooː.loo

Using the NATO phonetic alphabet for Z. Zulu is the military slang for zombies. At the beginning of the outbreak, zulu's were your typical shambling, slow moving corpses.

Earlier stage of the virus.