Prince William championed the effort of the NHS, the U.K.'s health agency, in delivering the COVID-19 vaccine in a video posted to Kensington Royal's Twitter account Saturday night.

The video included several health care professionals on a Zoom call, along with the Duke of Cambridge, talking about distributing and delivering the vaccine.

"This is because we have a world-leading NHS, this is because we have the right people, the right research and development here," William says in the video.

William also encourages people to get the vaccine when they are eligible, noting his "grandparents" -- Queen Elizabeth and Prince Philip -- got the vaccine already. The palace said last week that Elizabeth, 94, and Philip, 99, had gotten the vaccine.

"My grandparents have had the vaccine and I'm very proud of them for doing that," he says in the video. "So it's really important that everyone gets their vaccine."

Los Angeles County, the hardest hit region in the country right now, announced it has crossed 1 million confirmed cases of COVID-19 on Saturday.

The county has identified 1,003,923 cases since the start of the pandemic -- the first county in the country to cross the mark. Only four states outside of California have met that ignominious total. The county announced 253 new deaths and 14,669 new cases on Saturday.

There are currently 7,597 people hospitalized in LA County with COVID-19 -- down slightly from days earlier when the total crossed 7,900.

Also of concern, the county identified its first case of the so-called U.K. variant on Saturday. The case was discovered in a man who was recently in LA, but has since traveled to Oregon, where he is isolating, the health department said.

"The presence of the U.K. variant in Los Angeles County is troubling, as our healthcare system is already severely strained with more than 7,500 people currently hospitalized," said Dr. Barbara Ferrer, director of public health. "This more contagious variant makes it easier for infections to spread at worksites, at stores, and in our homes."

There had already been 40 cases of the variant, officially called the B.1.1.7 variant, detected in California.

The Norwegian Medicines Agency on Thursday reported a total of 29 people had suffered side effects, 13 of them fatal, according to The Associated Press. All the deaths occurred among patients in nursing homes and all were over the age of 80.

A spokesperson from the U.S. Food and Drug Administration told ABC News on Saturday regarding the deaths in Norway: "To date, we have not seen any new safety signals In the U.S. following administration of either authorized COVID-19 vaccine, and therefore do not currently plan to make any changes."

In the U.S. any reports of death following vaccination are "promptly and rigorously investigated" by the FDA and the Centers for Disease Control and Prevention, the spokesperson said.

Texas' third case of the COVID-19 variant, B.1.1.7, the same variant discovered in the United Kingdom, has been found in Dallas, Dallas County Health and Human Services reported in a statement Saturday morning.

"The individual is a male resident of the City of Dallas in his 20’s, with no recent history of travel outside of the United States. Results of genetic sequencing this week showed that the infection was caused by the variant. This is the first known case of this variant in a Dallas County resident. The individual is stable and is in isolation. DCHHS epidemiologists are involved with the investigation in identifying and notifying close contacts," the statement read.

- ABC News' James Scholz

Weeks after video emerged of mostly maskless partygoers at U.S. President Donald Trump's Mar-a-Lago Club in Palm Beach, county officials are cracking down.

Palm Beach County sent a letter this week, acquired by ABC News, warning the club and saying officials had met with representatives from the club about violations. Masks are mandatory in the county in all businesses or establishments, and anywhere in public social distancing cannot be maintained. The mandate is currently in place through Jan. 20 -- the same day the county's most famous resident will be exiting the White House.

"Thank you for meeting with us last week to discuss the concerning allegations regarding the Mar a Lago New Year's Eve party and lack of facial coverings being worn during evening activities," the county wrote in the letter addressed to Bernd Lembcke, executive vice president and managing director of Mar-a-Lago Club.

"We recount that you provided masks for all party goers who attended the party and that you provided additional masks for those that walked from the reception area to the main dining ballroom," the letter continued. "Although you provided these important steps, it seemed that based on the video evidence, there was a breakdown in enforcement of the mask orders that led to almost the entire room of guests being without masks during the later evening activities."

The letter also includes a confirmation of the violation, which is a first-time warning, that lays out a fine of up to $15,000 for each potential future violation.

Trump has consistently downplayed wearing masks over the course of the entire pandemic. Despite telling people to wear masks on occasion at official briefings, he also mocked others for wearing them, including President-elect Joe Biden. Many supporters have decried mandates and openly flouted rules, including maskless Trump supporters who stormed the Capitol last week.

ABC News' Will Gretsky contributed to this report.