US regulators have formally approved the single-shot Johnson & Johnson (J&J) coronavirus vaccine.
The vaccine is set to be a cost-effective alternative to the Pfizer and Moderna vaccines, and can be stored in a refrigerator instead of a freezer.
Trials found it prevented serious illness.
The vaccine was developed mainly by J&J's Janssen Pharmaceutical division.
The company has agreed to provide the US with 100 million doses by the end of June. The first doses could be available to the US public as early as next week.
The UK, EU and Canada have also ordered doses, and 500 million doses have also been ordered through the Covax scheme to supply poorer nations.
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