Pandemic: a disease prevalent over a whole country or the world. Britain might be in a good place today, just as we were during last summer, but remember that dreadful post Christmas spike in January? Yes, we have a selection of vaccines, thanks to worldwide scientific co-operation, but if we import one of the new variants, currently evolving in India and Brazil and elsewhere, and if the evil little beast turns out to be able to by-pass our vaccine immunity, what then? As Lyse Doucet of the BBC has said, 'No-one is safe until we are all safe.'