Covid-19 is not only a new nasty virus, but the techniques used in its discovery, monitoring and medical management are also new, particularly from my perspective as someone old enough to be in the highest priority group for vaccination. If the prime minister had suffered from the virus when I was a junior doctor at St Thomas’s Hospital, he wouldn’t have been treated in the Intensive Care Unit, because there wasn’t one. Residents of Lambeth with severe respiratory problems – and there were many because cigarettes were cheap and sulphurous smogs were common – were given oxygen on thirty-bed Nightingale wards, with tracheostomies if they were really sick. Monitors didn’t bleep. There weren’t any.