Dr. Deborah Birx, the White House coronavirus response coordinator, said she’s planning to retire but is available to help President-elect Joe Biden’s administration with the pandemic, The Associated Press reported.

This year has become the deadliest year in U.S. history, with overall deaths expected to climb above 3 million for the first time, The Associated Press reported.

So far 320,864 Americans have lost their lives to COVID-19, according to Johns Hopkins University data.

Pregnant women with COVID-19 during the third trimester are unlikely to pass the infection to their newborns, according to a study funded by the National Institutes of Health and published in the journal JAMA Network Open.

The study followed 127 pregnant women, and among the 64 women in their third trimester who tested positive for COVID-19, no newborns tested positive.

ABC News’ Adjoa Smalls-Mantey and Eric Strauss contributed to this report.

New York Gov. Andrew Cuomo is instructing hospitals across the state to test specifically for the variant of the coronavirus discovered in the United Kingdom.

“If we find the variant, we want to know where it is immediately,” Cuomo said. 

Cuomo said he does not support a travel ban from the U.K. into the U.S., but does believe the U.S. should follow New York state’s lead in requiring flights originating in the U.K. to have passengers test negative.

Dr. Anthony Fauci told ABC News’ “Good Morning America” Tuesday that “the possibility and maybe the likelihood of requiring the testing of individuals before they board a plane to the United States -- that is under active discussion.”

Fauci added, “you really need to assume” that the variant is already in the U.S.

ABC News’ Aaron Katersky contributed to this report.

The New York City health care provider under investigation for allegedly misappropriating the Moderna coronavirus vaccine, told ABC News it will return its vials to the state Health Department.

The New York State Department of Health is currently probing ParCare, which has offices in Brooklyn, to determine if it misused what was an approved allocation toward members of the public not yet prioritized under current New York guidelines.

Under the current state rules, only medical workers, first responders and nursing home staff members are allowed to receive any coronavirus vaccine. Other groups will follow in future rounds.

ParCare touted the vaccine on its social media pages with a flyer that claimed the vaccines would be available on a "first come, first serve basis."

"We have set up a special system where you can reserve your slot. This will enable you to receive the vaccine as soon as it arrives to the center," the flyer said.

The flyer also claimed that the vaccines were only for people who were "elderly," "high risk" or "underlying conditions."

New York state police and other investigators were at the ParCare location in Borough Park on Saturday night.

A spokesman for ParCare told ABC News Sunday evening that it is cooperating with the state investigation and will return its unused vials.

ParCare received 2,300 doses of the Moderna vaccine, and 869 of those doses have already been administered, according to the spokesperson.

"ParCare followed all NYS DOH procedures for obtaining the Moderna vaccine and was approved by NYS DOH for distribution and by CDC as a network site. As a result, we have properly received the vaccines and have provided the documentation regarding the proper receipt of the vaccines to the NYS DOH," the spokesperson told ABC News.

With regards to the patients who received their first shot, ParCare said it will be "working with the state to ensure that we provide the second dose for our patients."

-ABC News' Sasha Pezenik and Aaron Katersky contributed to this report