New York — US President Joe Biden is expected to announce later on Tuesday that Merck will help manufacture rival Johnson & Johnson's (J&J's) Covid-19 vaccine in a partnership, raising output of the single-shot treatment.

J&J's vaccine production has been slower than promised. Under its contract, the company was supposed to deliver 12-million doses by end-February, but had less than 4-million ready to ship when the vaccine was authorised on Saturday...

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