Biden: US 'on track' to have enough vaccines for all adults by May

President says he will direct states to prioritize teachers with a goal of vaccinating all educators by end of March

Joe Biden has said that the US expects to have enough coronavirus vaccines for all adults by the end of May, two months earlier than anticipated, as his administration announced that the drugmaker Merck would help produce Johnson & Johnson's newly approved shot.

With the bolstered supply, Biden also announced he would be using the powers of the federal government to direct all states to prioritize vaccinating teachers and said the government would provide the doses directly through its pharmacy program.