Explainer: The case for, and against, Covid-19 vaccine boosters

The US government aims to begin offering Covid-19 vaccine booster shots widely next week to Americans age 16 and up.

A panel of outside advisers to the Food and Drug Administration (FDA) voted against such broad coverage on Friday but backed a shot for people 65 and older, which the agency may or may not follow.

President Joe Biden's administration faces criticism within the...