Johnson & Johnson seeks emergency use approval for its single-dose Covid vaccine Premium Johnson & Johnson has asked U.S. regulators to clear the world’s first single-dose COVID-19 vaccine, an easier-to-use option that could boost scarce supplies (AP) Johnson & Johnson's vaccine would be the third authorized US, after those of Pfizer-BioNTech and Moderna The vaccine was overall 66% effective, the company said. And it is 85% effective in preventing severe forms of the disease Share Via Read Full Story Pharma giant Johnson & Johnson on Thursday sought emergency use authorization (EUA) of its Covid-19 vaccine from US health authorities, the company said in a statement.