https://apnews.com/5ba0ada40600e590fc3ab38bba046a94 > WASHINGTON (AP) — U.S. regulators expect to rule Wednesday on authorizing booster doses of the Moderna and Johnson & Johnson COVID-19 vaccines, a Food and Drug Administration official said at a government meeting. > The FDA's Doran Fink previewed “some announcements later today,” which were expected to include allowing the mixing and matching of COVID-19 booster doses among the three U.S. manufacturers — Pfizer, Moderna and J&J. Fink appeared at a meeting of vaccine experts convened by the Centers for Disease Control and Prevention, who are expected to take up the FDA decisions and make their own recommendations on Thursday.