U.S. Rep. Bonnie Watson Coleman, D-N.J. announced Monday that she has received a positive result for COVID-19 from a rapid antigen test and is awaiting results from a polymerase chain reaction (PCR) test.

Coleman said she was forced to shelter in place with unmasked colleagues last week when a mob of President Donald Trump's supporters stormed the U.S. Capitol building in Washington, D.C.

"Following the events of Wednesday, including sheltering with several colleagues who refused to wear masks, I decided to take a Covid test," Coleman, 75, wrote on Twitter. "I have tested positive."

The congresswoman, who previously received one dose of the Pfizer/BioNTech vaccine, said she is experiencing mild, cold-like symptoms and is isolating at home.

-ABC News' Mariam Khan contributed to this report.

Japan has identified a new variant of COVID-19, Dr. Tedros Adhanom Ghebreyesus, director-general of the World Health Organization, said during a Monday news conference.

Japanese health officials alerted the WHO of the new variant, which is different than COVID-19 variants first identified in the U.K. and in South Africa, over the weekend. High transmission of the virus in much of the world is giving it more chances to mutate and evolve into new variants.

"Most notably, transmissibility of some variants of the virus appears to be increasing," Tedros said. "This can drive a surge of cases and hospitalizations, which is highly problematic for health workers and hospitals already close to breaking point," he added.

"At present, the variants do not seem to show increased severity of disease," Tedros said.

-ABC News' Christine Theodorou contributed to this report.

COVID-19 killed more law enforcement officers in the line of duty than anything else in 2020, according to a new report.

The National Law Enforcement Officers Memorial Fund report found that 145 of the 264 federal, state, military, tribal and local law enforcement officer deaths last year were related to COVID-19, with that number expected to rise as more deaths from the virus are confirmed. Other officer fatalities in 2020 included car crashes, heart attacks, stroke and firearm deaths.

Last year marked the highest number of line-of-duty law enforcement deaths since 1974.

-ABC News' Brian Hartman contributed to this report.

It's just over a week into 2021 and the United States has already seen its worst week on record for both COVID-19 infections and deaths.

In the first 10 days of the month, the country has recorded some 2.35 million COVID-19 cases and more than 28,000 deaths from the disease. That works out to be around 163 Americans diagnosed with COVID-19 every minute, and approximately one American death from the disease reported every 30 seconds, according to an ABC News analysis of data compiled by The COVID Tracking Project, a volunteer-run effort to track the U.S. outbreak.

The U.S. has not seen a day with fewer than 100,000 new cases in more than two months, with a record-high average of 243,000 newly confirmed infections every day. In the last week alone, that average of daily cases has increased by approximately 16.3%.

Sunday marked the 41st consecutive day with more than 1,000 fatalities from COVID-19 reported nationwide. The country's average of daily deaths jumped by 21.4% in the last seven days.

Meanwhile, more than 129,000 people are currently hospitalized with COVID-19 across the U.S. -- a number that has hovered around 130,000 for the last several days.

At the current rate, January could surpass December's staggering COVID-19 totals to become the nation's hardest hit month of the pandemic.

ABC News' Brian Hartman and Arielle Mitropoulos contributed to this report.

Pope Francis and his predecessor, Pope Emeritus Benedict XVI, have received their first dose of a COVID-19 vaccine, according to Vatican spokesman Matteo Bruni.

"I can confirm that as part of the Vatican City State vaccination program to date, the first dose of the COVID-19 vaccine has been administered to Pope Francis and the Pope Emeritus," Bruni said in a statement Thursday.

Francis, who turned 84 last month and had part of a lung removed when he was younger, reportedly received the shot Wednesday while Benedict, 93, reportedly got it Thursday.

Vatican City, an independent enclave surrounded by Rome that serves as the headquarters of the Roman Catholic Church, launched the immunization campaign on Wednesday, administering doses of a COVID-19 vaccine developed by U.S. pharmaceutical giant Pfizer and its German partner BioNTech.

The tiny city-state has a population of only around 800 people but employs more than 4,000. It's unclear how many doses of the Pfizer/BioNTech vaccine have been procured so far.

Vatican City citizens, along with employees and pensioners, will have the opportunity to receive the vaccine as well as family members who are entitled to use of the city-state's health care system. Priority is being given to health care workers, public safety personnel, the elderly and individuals who are most frequently in contact with the public, according to Bruni.

The vaccination campaign is voluntary and people under the age of 18 are being excluded for the time being, Bruni said.

Since the start of the pandemic, Vatican City has reported at least 27 confirmed cases of COVID-19, according to a real-time count kept by Johns Hopkins University.

ABC News' Phoebe Natanson contributed to this report.