South African Health Minister Zweli Mkhize has called on final-year students who attended end-of-year parties to immediately self-quarantine for 10 days to prevent spreading the novel coronavirus.

Mkhize made the plea to students and parents on Sunday, after numerous people who recently attended "Rage" parties in Ballito and Jeffrey's Bay tested positive for COVID-19. The events are hosted every year in South Africa as thousands of students celebrate the end of matriculation.

"We confirm that we have now identified a number of COVID-19 confirmed cases arising from these super-spreader events," Mkhize said in a statement. "This therefore means that if you attended any of these Rage events, you are now regarded as a contact."

In addition to quarantining, Mkhize also urged attendees to get tested as soon as possible.

South Africa has the highest tally of COVID-19 infections in all of Africa, with more than 814,000 confirmed cases including over 22,000 deaths.

Doses of the COVID-19 vaccine developed by U.S. pharmaceutical giant Pfizer and its German partner BioNTech have been delivered across the United Kingdom, ahead of the launch of the country's immunization program.

The potentially life-saving vaccine will be administered nationwide starting Tuesday morning, and some 800,000 doses were expected to be in place for the first day of what will be the largest-scale immunization program in U.K. history.

Vaccinations will be rolled out in phases, with elderly care home residents and their carers first on the priority list, followed by anyone else aged 80 and over, as well as frontline health and social care workers.

Last week, the U.K. became the first country in the world to authorize the Pfizer/BioNTech vaccine for emergency use. The vaccine was shown in late-stage clinical trials to be more than 95% effective in preventing COVID-19.

U.S. President-elect Joe Biden's transition team said the Trump administration still has not shared its distribution plans for COVID-19 vaccines.

"We have yet to see any kind of detailed plan," Dr. Celine Gounder, an infectious disease specialist who is a member of Biden's transition COVID-19 advisory board, said in an interview Monday on "CBS This Morning."

"We really need to understand what their plan for distribution is," she added. "We've already been trying to get a handle on how many doses will be available to us from each of the companies and by when, but we do need some internal information on that from the federal government. We also need to understand where they are with their plans."

U.S. Surgeon General Jerome Adams urged people to take the coronavirus pandemic seriously and follow public health guidelines as infections and hospitalizations soar across the country.

"I want the American people to know this virus is incredibly unforgiving, cases are going up, hospitalizations are going up, my colleagues are dog-tired and we need you to hang on just a little bit longer because we've got vaccines coming but we want as many people to be alive to get them as possible and a lot of that is going to depend on your behavior," Adams told ABC News chief anchor George Stephanopoulos in an interview Monday on "Good Morning America."

Although "more people than ever are wearing masks," Adams said he's "very" concerned by the number of people who still "don't understand how much spread is occurring by people who don't have symptoms."

About 20 million "full doses" of COVID-19 vaccines will be available by the end of the year, according to Adams, who urged every American to be immunized against the virus as soon as a vaccine is authorized and made available.

"It's a way that we can ultimately end this pandemic, but it doesn't matter if people won't get the vaccination," the surgeon general said. "We know that vaccine levels are only about 50% for adults for flu and they go down to about 40% for African-Americans."

Adams said he is working with historically black colleges and universities as well as faith communities to bolster vaccine confidence among all populations. The White House is also hosting a vaccine summit Tuesday, he said.

"One thing you can all do right now, it's national flu immunization week, get your flu shot because half a million people were hospitalized last year with the flu," Adams said. "We simply can't afford for that to happen this year with hospitals being overwhelmed."

The surgeon general said the current surge in infections across the country "is different than earlier surges," because it's not about a lack of masks or personal protective equipment, nor is it due to a lack of testing.

"It's really about health care capacity, and certain places are just being overwhelmed," he said. "So we know that we can actually help them with their health care capacity by immunizing their health care staff. We're going to leave it up to the states, but we're going to give them guidance."

Adams noted it's also important to vaccinate those who are most likely to die from COVID-19.

"We know that 40 to 50% of the deaths are occurring in people who are in longterm care facilities who are older," he said.

Nevada Gov. Steve Sisolak extended his state's coronavirus restrictions through at least Jan. 15 as COVID-19 cases and deaths surge in the Silver State.

Nearly every state in the U.S. reports more than 100 people hospitalized per million, according to the COVID Tracking Project. However, Nevada reports 592, which translates into one out of 1,700 people in the state, according to the project.

"We continue to see an increase of hospitalizations statewide with almost 1,700 Nevadans battling COVID as of Friday," Sisolak said at a press conference Sunday.

The governor also announced Sunday that he would sign an order to place a moratorium on most residential evictions in Nevada.

Since the start of the pandemic, Nevada has had more than 186,000 cases, with at least 2,529 deaths.