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 April 13, 2021 at 8:43 AM ET

This page is updated regularly.

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 189 million doses have been administered, fully vaccinating over 74 million people or 22.3% of the total U.S. population.

President Trump has become the only president in U.S. history to be impeached twice.

The Democratic-led U.S. House of Representatives delivered the historic rebuke to Trump on Wednesday afternoon — exactly one week after his supporters stormed the U.S. Capitol building in a rampage that led to five deaths, including that of a Capitol Police officer.

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.

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Updated April 13, 2021 at 10:20 AM ET

Note: This story will be updated periodically, as new data are released.

Updated April 13, 2021 at 7:19 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.

Wildfires near cities have become commonplace in the Western United States, but this year the reach and intensity of the dangerous air pollution they produce has been the worst on record.

Many Americans in populous, urban areas endured smoke for longer than previous years. Some places experienced very unhealthy or hazardous air from wildfires for the first time ever recorded.

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 April 1, 2021 at 5:14 PM ET

For the first time during the pandemic, members of Congress hit a milestone on April 1 with no reported cases of coronavirus among their ranks for at least two months straight.

The pause comes as a large share of the 535 lawmakers were fully vaccinated by the start of 2021 after coronavirus exacted a large toll on the Capitol.