The nation’s top public health agency said Friday that in-person schooling can resume safely with masks, social distancing and other strategies, and vaccination of teachers, while important, is not a prerequisite for reopening.

A person who travelled from London to Sweden to celebrate Christmas has been confirmed sick with the new and more infectious variant of the coronavirus that has been rapidly spreading in the UK recently.

A series of missteps at the nation's top public health agency caused a critical shortage of reliable laboratory tests for the coronavirus, hobbling the federal response as the pandemic spread across the country like wildfire, an Associated Press review found.