U.S. Surgeon General Jerome Adams tweeted Thursday morning that his wife had been admitted to a hospital because of complications with her cancer treatment. He said he wasn’t allowed to visit her because of COVID-19-related restrictions.

Adams’ wife, Lacey Adams, was first diagnosed with metastatic melanoma in 2018.

“I’m hoping she doesn’t have to spend New Year’s in a hallway because the beds are full,” Adams tweeted.

ABC News’ Ben Gittleson and Tom Dunlavey contributed to this report.

At least 342,734 lives have been lost to COVID-19 in the U.S., representing approximately 18.9% of the total global death toll of 1.8 million people.

One in every 965 Americans has now died from the virus, according to ABC News’ of data compiled by the COVID Tracking Project.

The U.S. death toll is 114 times the total lives lost on Sept. 11, 2001, and just over half the total number of deaths that were recorded in U.S. during the 1918 influenza pandemic.

At least 19.7 million Americans have tested positive for COVID-19 in the 345 days since the Centers for Disease Control and Prevention confirmed the first U.S. case on Jan. 21.

That means about 1 in every 16 Americans has contracted the virus.

ABC News' Arielle Mitropoulos contributed to this report.

The oldest resident of Massachusetts, 112-year-old Hazel Plummer, received her first dose of the vaccine on Wednesday.

Plummer was among the 49 residents and 50 employees at the Life Care Center of Nashoba Valley, a nursing home in Littleton, Massachusetts, to do so.

The Life Care Center of Nashoba Valley suffered from the coronavirus outbreak in the spring but “was free of COVID-19 by the end of May,” the facility said.

ABC News’ Arielle Mitropoulos contributed to this report.

In Wuhan, China, where COVID-19 was first identified in December 2019, small crowds gathered to take in a fireworks display and ring in 2021.

Wuhan was the first epicenter of the pandemic, but the central Chinese metropolis of 11 million emerged out of lockdown in mid-April and has not had a reported case since May.

In New York City, no New Year’s revelers will be gathering in Times Square to watch the ball drop this year.

New York City Mayor Bill de Blasio said this is "the most moving New Year's Eve," but urged New Yorkers to "watch on TV. Don't go down there."

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.