Biden's bold pledge to vaccinate 100m Americans in 100 days faces stern test

• New president warns of ‘toughest period of the virus’
• US has recorded more than 400,000 deaths from Covid

With President Joe Biden now in the White House his bold pledge to vaccinate 100 million people in 100 days is to be tested.

Related: ‘This is our historic moment of crisis and challenge’: Joe Biden calls for unity in first speech as president – live

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https://www.theguardian.com/us-news/joebiden