President Biden has announced that pharmaceutical giant Merck will help make Johnson & Johnson’s single-shot coronavirus vaccine to sharply boost the supply of the newly authorized vaccine.

Under the arrangement, Merck will dedicate two facilities in the United States to Johnson & Johnson’s shots. One will provide “fill-finish” services, the last stage of the production process during which the vaccine substance is placed in vials and packaged for distribution. The other will make the vaccine, and has the potential to vastly increase supply, perhaps even doubling what Johnson & Johnson could make on its own, the officials said.

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