Audrey Carlsen

Ever since the coronavirus reached the U.S., officials and citizens alike have gauged the severity of the spread by tracking one measure in particular: How many new cases are confirmed through testing each day. However, it has been clear all along that this number is an understatement because of testing shortfalls.

Now a research team at Columbia University has built a mathematical model that gives a much more complete — and scary — picture of how much virus is circulating in our communities.

Updated October 28, 2021 at 9:34 AM ET

This page is updated on weekdays.

Vaccinating a high percentage of the population against COVID-19 is a crucial part of the U.S. strategy to curb the pandemic.

Since COVID-19 vaccine distribution began in the United States on Dec. 14, more than 416 million doses have been administered, fully vaccinating over 190 million people or 57.5% of the total U.S. population.

The Democratic-controlled House approved a resolution Tuesday night calling on Vice President Pence to invoke the 25th Amendment of the Constitution to assume the powers of the presidency.

Updated May 28, 2021 at 2:50 PM ET

The U.S. Senate continues to take up President Biden's nominees for key roles.

The top figures in an administration are made up of a combination of Cabinet and high-ranking nominees who require Senate confirmation, and senior advisers tapped by the president, who don't require congressional approval.

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