School-aged children in Britain have been the subject of intense debate about vaccinations. (Leon Neal/Getty Images)

LONDON — It was a relatively easy call to vaccinate the elderly against the coronavirus and keep them from getting seriously sick. But as rich countries rapidly work their way through the age groups, the vaccination of children is proving highly emotive and contentious.

That’s especially so in Britain. Just two weeks ago, government advisers said that the “minimal benefits” of vaccinating those under 18 didn’t outweigh the potential risks. Yet on Wednesday, those same advisers said 16- and 17-year-olds should get jabbed as soon as possible. Though only one dose, for now. And most younger children should still wait.