Horde

A horde is a massive group of normal Infected who attack all at once, reminiscent of the movie 28 Days Later. They attack using their sheer numbers and speed to attempt to overcome the Survivors. Hordes can occur due to a Survivor being splattered by a Boomer, setting off a car alarm, when the AI director causes a rise in activity, and also when the survivors remain in one area for a prolonged period of time. An incoming horde is prefaced by a musical horn cue in the soundtrack followed by a burst of techno music that plays until the horde's numbers have been significantly reduced.