As if the normal infestation of Chernarus with infected was not bad enough, now reports of entire hordes of zombies have come in from survivors.
These hordes are dangerous dynamic events that can be encounteres on YourZ. They arent to dangerous during the day, as long as you avoid them. Actually fighting them might be worth your time though as it is said that very precious shiny loot can be found on certain zombies of the horde. Be however careful during the nighttime. Zombies seem to change their behavior slighty once the sun is setting.