To vaccinate more people quickly, the UK is making people wait up to three months for a booster shot rather than the few weeks tested in trials. Here’s what the evidence says about the situation

By Clare Wilson
People wait for a covid-19 shot at a vaccination centre in Epsom, UK
Dominic Lipinski/Pool/AFP via Getty Images
IN A bid to vaccinate as many people as fast as possible, the UK is taking an unorthodox strategy against covid-19. The country is eking out its vaccine supply by making most people wait three months to get their second dose of the two-shot regimen.
Both vaccines currently being used in the UK were intended to be given over much shorter timescales. Changing a medicine’s dosing schedule so dramatically is unprecedented, and some experts have branded it a dangerous gamble, putting lives …