Live coverage has ended on this blog, please click here for NBC News' latest coverage of Covid-19.
The controversial White House coronavirus adviser, Dr. Scott Atlas, resigned on Monday.
Atlas has no background in infectious diseases, has spread misinformation about the virus and downplayed its seriousness. President Donald Trump invited him to join the task force in August after having seen him on Fox News.
Meanwhile, an analysis of 4.4 million student test scores suggested the pandemic has exacerbated long-standing educational disparities, possibly setting the most vulnerable children even further behind.
- 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.
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