Enough vaccines for every adult by end of May -Biden

Biden announced that Merck & Co Inc will help make rival Johnson & Johnson's single-shot COVID-19 vaccine in a partnership that he said was similar to those seen during World War Two. With three vaccines now available, Biden said he was confident the country would reach his goal of delivering 100 million COVID-19 vaccine doses in 100 days.

He also ordered U.S. states to prioritize COVID-19 vaccinations for teachers to ensure children could return to school quickly and safely, and called for every educator to receive at least one shot by the end of March.