NYC Taking Vaccines to Beaches; Moderna for Teens: Virus Update Bloomberg 1 hr ago Bloomberg News (Bloomberg) -- Moderna Inc.’s vaccine was highly effective in younger teens in a large study, putting it on track to become the second shot authorized in the U.S. for adolescents. A White House official said that half of American adults will be fully vaccinated as of Tuesday. The impact of inoculations is causing a reversal of fortunes in Bloomberg’s Covid Resilience Ranking, with last month’s leader -- Singapore -- falling along with other Asian economies that had been lauded for thwarting the virus.