Horde

Finding plague victims inside their camp, survivors of the zombie apocalypse suspect that the zombie plague has mutated and is being spread by spores emitted by infected flesh-eating ghouls. People infected by the spores could be asymptomatic carriers. Not only do the survivors have to worry about being bitten by rampaging flesh-eating ghouls but also about being infected by inhaling spores emitted by a carrier within their camp.