“Roughly two and a half years into the pandemic, White House officials and health experts have reached a pivotal conclusion about Covid-19 vaccines: The current approach of offering booster shots every few months isn’t sustainable.

Though most vaccines take years to develop, the Covid shots now in use were created in record time—in a matter of months. For health authorities and a public desperate for tools to deal with the pandemic, their speedy arrival provided a huge lift, preventing hospitalizations and deaths while helping people to escape lockdowns and return to work, school and many other aspects of pre-Covid life.”