giving full approval to the pfizer vaccine for americans 16 and older, making it the first vaccine to move past emergency use authorization. if you re one of the millions o americans who said that they will not get the shot until it has full and final approval of the fda, it has now happened. the moment you ve been waiting for is here. reporter: the president calling the fda s review process the gold standard. the pfizer vaccine found to be 91% effective in preventing covid-19. in just eight months, americans have received 200 million pfizer doses, with a billion more given around the world. the vaccine is now among the most studied in history. full approval for the pfizer vaccine now paving the way for more vaccine mandates from schools, governments and corporations. and with a surging delta variant, the president is pushing companies to act. if you re a business leader, a nonprofit leader, a state or