The 28 days later scenario is also quite fictional. No parasitic creature in existence keeps its host alive they just feed and move on. The zombie concept is an excuse used to dehumanize humans making them appealing and acceptive to kill. It gives the loners outside of society something to hope for. Movies leverage a zombie plot to give the beta's of a culture stage time.
I've never seen 28 days later, but a parasite that changes the host's behavior is not a far out concept. It's been documented in the real world in snails, rats, and ants.
With snails a parasitic worm that can only reproduce inside this type of bird infects the snail and changes its behavior to crawl up to the treetops, something a snail would never do, and sit there waiting to be eaten by the bird. The worms move to the tentacles of the snail and change the color of the tentacle to one that catches the bird's eye so that birds will come quicker and also only bite the tentacle which doesn't kill the snail.
With rats the parasite once again infects a host, the rat, but can only reproduce in its predator, a cat. The parasite makes the rat go out into the open and stop, almost paralyzed, to let the rat eat it, thus moving the parasite to the cat where it can reproduce.
In ants, if I remember correctly it was a fungus that, once in the ant, forces it to abandon the colony, go to a cool damp area ideal for fungus growing, and lay there as the fungus grows in it and eventually explodes out of it.
While the parasite may not keep the host alive, it definitely alters its behavior to make it spread as much as possible, which, in the case of classic zombies would be making it bite other humans.
Ok, so it got some to read iabout emergency preparedness...... but did it actually get anyone (here) to consider actually making emergency preparations?
It would have gotten me to... had I not already made preparations