Mold

I watched a nature show, where an ant had a fungal infection: it's body and mind were deteriorating. Another ant carried it as far away from the colony as possible to die. When it did, it started sprouting mushrooms. Wouldn't that be a disturbing zombie film?! A airborne fungus that affected the human race, causing live bodies to decompose from the inside out and their minds turning into something worse than Alzheimer's/dementia. And once they finally dropped dead and cracked open from decomposition, the spores would go flying into the atmosphere. What kind of post-apocalyptic world would that be?