The Food and Drug Administration (FDA) vaccine advisory group today unanimously approved a booster dose of Johnson & Johnson (J&J) vaccine for all Americans 18 years old and older who received a single dose.Also today, the experts discussed mix-and-match dosing, raising several questions and airing multiple issues, but they took no vote on the issue.Booster would target all J&J recipientsToday's vote by the FDA's Vaccines and Related Biological Products Advisory Committee (VRBPAC)—affirming that data support the safety and effectiveness of the J&J booster dose—was unanimous and followed the group's unanimous nod for Moderna boosters yesterday for high-risk groups.The group's decision is nonbinding, and FDA officials will make the final