And the movie opens with this scene

KILLER BUG AIR SCARE
"A WOMAN who arrived in London on a flight from Africa yesterday is reported to have died from the deadly and contagious ebola virus."

And it ends with just a small band of plucky survivors. Time to head for the hills?

Actually, I'm told that Ebola isn't really that contagious. And no, thank you, I don't shake hands any more.