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.

An increasing number of children are being infected with multisystem inflammatory syndrome in children (MIS-C), according to a statement Saturday relased by Los Angeles County Board of Supervisors Chair Hilda L. Solis, supervisor to the First District.

"It is heartbreaking that every day, more than 14,000 Los Angeles County residents are testing positive for COVID-19. It is even more painful to see an increasing number of children being infected by MISC-C. There is a misconception that COVID-19 only impacts those who are older or those with underlying health conditions. At this point in the crisis, we can say for certain that COVID-19 causes severe consequences in people of all ages, including children, and even without underlying health conditions. In Los Angeles County, the Latinx community is bearing the brunt of COVID-19 and MISC-C cases," the statement read.

There have been 51 total cases of MIS-C in children, including one child death. All 51 children with MIS-C were hospitalized and nearly 50% of the children were treated in the intensive care unit. Of the children with MIS-C, 31% were under the age of 5 years old, 38% were between the ages of 5 and 11 years old, and 31% were between the ages of 12 and 20 years old. Latinx children account for nearly 73% of the reported cases, according to the statement.

Experts say the inflammatory syndrome resembles toxic shock syndrome and Kawasaki disease, itself a rare inflammatory disease typically affecting children under the age of 5, and has the potential to be deadly.

-ABC News' Matthew Fuhrman, Olivia Rubin and Soo Rin Kim