Oh, don't be annoying me with your Q Fever! I have been looking forever for a short story about a space traveller who comes back to earth after long years and finds the place empty of humans; first thing he sees is a sign saying

WAR Q

on a cliff; he doesn't know that language changed in the centuries he was away, and this meant "Beware Q"; every human on earth has been killed by an epidemic of Q Fever.

Meanwhile the German vaccine advisory group has put out a notice that they don't, for the moment, advise the AstraZeneca vaccine for over-64s, as it's not sufficiently tested for them.