A cure for Covid may arrive faster than a vaccine

A striking feature of Covid-19 is how medieval our response has had to be. Quarantine was the way people fought plagues in the distant past. We know by now that it will take many months to get a vaccine, whose job is to prevent you getting the disease. But what about a cure once you have caught it: why is there no pill to take? The truth is that, advanced as medical science is, we are mostly defenceless against viruses. There is no antiviral therapy to compare with antibiotics for treating bacteria.

Arguably, virology in 2020 is where bacteriology was in the 1920s. At the time, most of the experts in that field — including Alexander Fleming and his mentor, the formidable Sir Almroth Wright (nicknamed Sir Always Wrong by his foes) — thought a chemical therapy that killed bacteria without harming the patient was a wild goose chase. Instead, they argued, theway to fight bacteria was to encourage the body’s immune system.