‘Herd immunity’ is impossible without a vaccine

My great-grandfather did not fight in the war. He wasn’t a conscientious objector — he was a scientist helping to develop radar. It’s tempting to imagine family history repeating itself. I’m not alongside my colleagues on the NHS front line; instead I’ve been part of a large team at the Crick Institute, helping to develop tests for Sars-CoV-2, the causative agent of Covid-19. For the first phase of our struggle against this virus, we’ve had minimal testing capacity — no radar — and we’ve suffered the consequences.

The director of our institute, Sir Paul Nurse, borrowed another wartime analogy when he imagined academic labs as a flotilla of ‘little ships’, as at Dunkirk, that could be set up quickly to help rescue a rather desperate situation. The protocols we’ve developed have been downloaded more than 5,000 times, and we’ve helped other testing laboratories (including the big ones that are now coming online) with re-agents and scientific advice.