WSJ Biden estimates Vaccine for all adults by late May
Previously, based on production of Pfizer and Moderna vaccines, it was estimated that enough vaccine for all adults would be on hand by mid July, but with J&J now approved, and the agreement between J&J and Merck to increase production, the estimate has been revised to the end of May.
Merck learned late last year that its vaccine candidate was a dud and reached out to J&J to assist in production, much as Sanofi and Novartis did with Pfizer last fall when their vaccine efforts disappointed. J&J and Merck reached an agreement to cooperate as soon as J&J was approved by the FDA.
Novavax, assisted by Baxter and Endo International, will similarly cooperate but it is likely that vaccine will come too late to be used in the US.