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 June 15, 2021 at 8:20 AM ET

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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 310 million doses have been administered, fully vaccinating over 145 million people or 43.7% 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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Updated May 24, 2021 at 3:24 PM ET

Note: This story is no longer being updated.

As COVID-19 continues to spread across the country, state and local health officials rush to try to detect and contain outbreaks before they get out of control. A key to that is testing, and despite a slow start, testing has increased around the country.

But it's still not always easy to get a test. While many things can affect access to testing, location is an important starting point.

Updated May 4, 2021 at 1:02 PM ET

Members of Congress have hit a milestone this year with no reported cases of the coronavirus among their ranks for at least three months straight.

The pause comes as a majority of more than 500 lawmakers were fully vaccinated by January 2021 after the coronavirus exacted a large toll on the Capitol over the course of the pandemic.