Biden to announce Merck will help make Johnson & Johnson’s Covid vaccine

President Joe Biden will announce Tuesday that pharmaceutical giant Merck will help make Johnson Johnson’s Covid-19 vaccine, a senior administration official confirmed to NBC News.

The announcement comes as the administration works to ramp up production of JJ’s single-shot vaccine. Senior administration officials said Sunday the U.S. government would ship JJ’s entire inventory of 3.9 million doses this week, adding that supply would be “uneven” in the following weeks. Sixteen million more doses are expected by the end of the month.

This is a developing story. Please check back for updates.