Why we can be confident in the safety of Covid vaccines

At the beginning of the Covid crisis, some expressed the hope that a pandemic might at least bring a divided country back together. Instead, public discourse descended to new levels of bitterness as a fresh schism replaced that caused by Brexit. On one side were those who thought tens of thousands would die because government action was too slow and half-hearted, and on the other, those who thought lockdown to be an over-reaction that inflicted grave damage on our economy and society.

Both sides ought now to be able to agree that this week marks a significant turning point in the pandemic. The first shot of an approved Covid vaccine to be administered in a public programme anywhere in the world was given to Margaret Keenan, a 90-year-old woman in a Coventry hospital. There are still some uncertainties: we don’t yet know how good the vaccine is at preventing transmission of the virus, or how long immunity will last.