Who can use the term "gone viral" now without shuddering a little? Who can look at anything any more - a door handle, a cardboard carton, a bag of vegetables - without imagining it swarming with those unseeable, undead, unliving blobs dotted with suction pads waiting to fasten themselves on to our lungs?
Who can think of kissing a stranger, jumping on to a bus or sending their child to school without feeling real fear? Who can think of ordinary pleasure and not assess its risk? Who among us is not a quack epidemiologist, virologist, statistician and prophet? Which scientist or doctor is not secretly praying for a miracle? Which priest is not - secretly, at least - submitting to science?