Margaret Keenan, the 91-year-old grandmother in the United Kingdom who was the first in the world (outside of clinical trials) to get the Pfizer vaccine, got her second dose on Tuesday.

Keenan, then 90, received her first dose on Dec. 8.

ABC News’ Rashid Haddou contributed to this report.

Dr. Anthony Fauci says the pandemic has “gotten out of control” and warned that January may be worse than December.

“That is what we're concerned about,” Fauci told CNN. “That in addition to the surge, we're going to have an increase … which could make January even worse than December. I hope not, I hope that doesn't happen, but it certainly is possible.”

“I think we just have to assume that it’s gonna get worse,” he said.

In terms of vaccines administered so far, Fauci said, “We certainly are not at the numbers that we wanted to be at the end of December.”

Over 11.4 million vaccine doses have been distributed and 2,127,143 Americans have received their first vaccine dose, according to the CDC.

Fauci said he believes there’ll be “an increase in the momentum” of vaccinations in January.

“Not being responsible myself for the rollout, I can't personally guarantee that we’re gonna catch up,” Fauci said. “I hope we do.”

Assistant Secretary for Health Adm. Brett Giroir said the data on people vaccinated is delayed.

“We know that’s underreported because there’s a three to seven-day delay. But we expect that to ramp up,” Giroir told MSNBC Tuesday..

ABC News’ Brian Hartman contributed to this report.

A preliminary analysis from Public Health England found that the new COVID-19 variant detected in the United Kingdom isn’t more deadly than the prior dominant variant.

It’s still likely that the new variant is more easily transmissible, because of the speed at which it has outpaced the prior variant.

This new variant now accounts for over half of the new positive cases in the U.K., the study said.

The variants are all the same virus, no matter their small genetic differences. SARS-COV-2 is a respiratory virus, meaning it is transmitted through droplets, so masks and social distancing still work to slow transmission, no matter the variant.

In addition to several European nations, the variant has also been reported in North America and Asia.

ABC News’ Ian Pannell, Sony Salzman and Christine Theodorou contributed to this report.

Russian Deputy Prime Minister Tatiana Golikova told reporters Monday that Russia’s total number of deaths from all causes during the pandemic has risen by 13.8% between January and November compared to the same period last year.

Of those excess deaths, Golikova said 81% of them were caused by COVID-19.

Data released by Russia’s state statistics agency shows that Russia has recorded 230,000 more deaths this year compared to 2019. If 81% of those are COVID-19 related, then the country’s total COVID-19 death toll is 186,000.

That is three times more than the official death toll published by the country’s health authorities (54,000).

A total of 186,000 fatalities would bring Russia’s death toll to the third worst in the world behind the U.S. and Brazil.

ABC News’ Patrick Reevell contributed to this report.

The Centers for Disease Control and Prevention updated its guidelines for people with underlying health conditions planning to take a COVID-19 vaccine.

They CDC said that adults with underlying medical conditions -- who are more at risk of becoming seriously ill from COVID-19 -- can receive a vaccine against the virus as long as they have not had a severe allergic reaction to any of the ingredients in it.

The new guidelines state that people with HIV and those with weakened immune systems due to other illnesses or medication should be aware that information about the safety of COVID-19 vaccines for their group is not yet available. While people with HIV were included in clinical trials, more data is required to provide safety guidelines regarding the effects a vaccine could have on them. The same is true for people with autoimmune conditions.

People who have previously had Guillain-Barre syndrome or Bell’s palsy may receive a COVID-19 vaccine, though experts are still acquiring more data about their groups as well.

The CDC added that people should continue to follow coronavirus health measures -- such as wearing a mask and staying 6 feet away from others -- after receiving the shot, as experts have more to learn about the protection that COVID-19 vaccines provide under real-life conditions.