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pharmaceutical giant Merck will help manufacture its rival Johnson and Johnson's newly approved coronavirus vaccine, according to a White House official.
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In an effort to ramp up supply of the single dose vaccine more quickly, J and J's production has been slower than promised.
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Under its contract, the company was supposed to deliver 12 million doses by the end of February, but had less than four million ready to ship when the vaccine was authorized.
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On Saturday, the O.
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J and J says it will be able to provide the full 100 million doses it had agreed to supply by its original mid year deadline.
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More doses sooner could speed the US vaccination effort considerably because as a one dose vaccine, it is possible to inoculate twice as many people with the same number of shots.
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The other two US approved vaccines from Pfizer and Biontech and Moderna, require two doses.
