Covid live updates: New virus strains emerge, states expand vaccine distribution
On the eve of his inauguration, President-elect Joe Biden led the nation in mourning the 400,000 people across the United States who have died in the coronavirus pandemic.
"To heal, we must remember," Biden said, just before 400 lights illuminated the Lincoln Memorial Reflecting Pool, each representing a thousand Americans who died.
Map of U.S. hot spots and worldwide Covid-19 cases.
Tracking surges in states across the country this winter.
Map of travel restrictions and which states have a mask mandate.
Click here for more of NBC News' Covid-19 coverage.
