WASHINGTON (AP) — U.S. health advisers have endorsed a one-dose COVID-19 vaccine from Johnson & Johnson that’s expected to provide an easier-to-use option to fight the pandemic. The panel of Food and Drug Administration experts ruled on Friday that J&J’s vaccine protected against COVID-19 and should be made available for adults. The FDA said in a statement it will quickly follow the recommendation and make J&J’s shot the third vaccine authorized for emergency use in the U.S. Shipments of a few million doses could begin as early as Monday. More shots are urgently needed to stay ahead of a mutating virus that has killed more than 500,000 Americans.