Beginning Jan. 26, those flying to the U.S. from foreign countries must follow new rules that were announced by the Centers for Disease Control and Prevention on Tuesday.

Passengers must take a COVID-19 test “within the 3 days before their flight to the U.S. departs, and provide written documentation of their laboratory test result (paper or electronic copy) to the airline or provide documentation of having recovered from COVID-19,” the CDC said.

“Airlines must confirm the negative test result for all passengers or documentation of recovery before they board,” the CDC said. “If a passenger does not provide documentation of a negative test or recovery, or chooses not to take a test, the airline must deny boarding to the passenger.”

The CDC also asks travelers “to get tested again 3-5 days after arrival and stay home for 7 days post-travel.”

ABC News’ Anne Flaherty contributed to this report.

Democrats are moving forward Tuesday night with plans to implement a mask requirement on the House floor.

As part of their first vote series, they will adopt language implementing a fine system for noncompliance with Speaker Nancy Pelosi's mask requirement, according to a senior House Democratic aide.

Members will be fined $500 for their first offense and $2,500 for their second offense. Fines will be deducted from members' pay.

Separately, a House administrative body will review whether to add a new fine system for non-compliance in the House office buildings on the south side of the U.S. Capitol complex.

Three House Democrats have tested positive for COVID-19 since the Capitol siege.

ABC News’ Ben Siegel contributed to this report.

Rep. Brad Schneider, D-Ill., said he tested positive for COVID-19 on Tuesday, becoming the third Democrat to do so after sheltering at the Capitol with several Republicans who were unmasked for "several hours” during Wednesday’s siege.

After “narrowly escaping” the violence, Schneider said in a statement, “I was forced to spend several hours in a secure but confined location with dozens of other Members of Congress. Several Republican lawmakers in the room adamantly refused to wear a mask.”

“I am now in strict isolation, worried that I have risked my wife’s health and angry at the selfishness and arrogance of the anti-maskers who put their own contempt and disregard for decency ahead of the health and safety of their colleagues and our staff,” he continued.

Schneider said he hasn't had any symptoms and that he drove home from Washington, D.C., to Illinois.

Rep. Pramila Jayapal and Rep. Bonnie Watson Coleman, both Democrats, have also said they tested positive following the Capitol siege.

Schneider is joining the growing number of Democrats demanding that the House sanction members who don’t wear masks on the House floor.

At a virtual press conference Tuesday, Schneider said, "I don’t know from whom I got this virus or even necessarily if I got it in that room. But I know that my exposure in that room was greater than at any other time through this entire pandemic.”

ABC News’ Ben Siegel and Matthew Vann contributed to this report.

Two people from Anne Arundel County, Maryland, are confirmed to have the coronavirus variant that originated in the United Kingdom, Gov. Larry Hogan said, reported WBAL-TV.

The couple traveled to multiple continents, the governor said. They are in isolation and state officials are conducting contact tracing, WBAL-TV reported.

Maryland is at least the 10th state to confirm the presence of the U.K. variant, following Connecticut, Minnesota, Georgia, Colorado, New York, Florida, California, Pennsylvania and Texas.

The U.K. variant appears to spread more easily but there’s no evidence that it is more deadly.

ABC News’ Dee Carden contributed to this report.

Mississippi has allotted its entire supply of COVID-19 vaccines and doesn't expect more doses until mid-February, the state health department announced Wednesday.

"Neither the county health department drive-through sites, nor the [University of Mississippi Medical Center] vaccine scheduling website was designed to accommodate the monumental surge we are currently experiencing," the Mississippi State Department of Health said in a statement. "At this time, we have no additional vaccine, and every appointment is tied to an actual vaccination."

New appointments are expected to resume after an anticipated vaccine resupply in mid-February, the department said.

On Tuesday, the state opened vaccine eligibility to people ages 65 and older and those with certain chronic health conditions, which led to an influx of calls to the state's COVID-19 hotline, officials said. Previously, vaccinations were prioritized for health care workers, long-term care residents and those over the age of 75.

"We decided to open vaccines to many more people. We knew it would cause a rush, but believe it is more fair than having government arbitrarily limit access," Gov. Tate Reeves said on Twitter Wednesday evening.

As of Tuesday, the state had administered 62,744 vaccinations over the last four weeks, Reeves said during a press briefing.

ABC News' Will Gretsky contributed to this report.