The game between the Miami Heat and the Boston Celtics Sunday night has been postponed after Miami announced it does not have the minimum eight players available because of ongoing COVID-19 contact tracing, ESPN reported.

Earlier Sunday, Heat guard Avery Bradley was placed into the health and safety protocol and was ruled out for Sunday night's game.

The Celtics were set to play with the minimum eight players after nine players were ruled out, including seven because of the NBA's health and safety protocols.

The NBA postponed a Dec. 23 game between the Oklahoma City Thunder and the Houston Rockets after the Rockets didn't have the minimum number of available players.

The coronavirus pandemic has affected at least 90 million people worldwide, according to data from John Hopkins University's Coronavirus Resource Center.

There were an additional 10 million global cases reported over the last 15 days, the data showed.

As of Sunday, 1,931,571 COVID-19 deaths have been reported around the globe, Johns Hopkins said.

The United States leads the world with cases and deaths, according to the data.

As of Sunday, the U.S. has 22,293,281 cases, roughly a quarter of the total world cases, and 373,588 deaths, roughly 19% of the world's deaths, Johns Hopkins reported.

California's coronavirus surge continues to worsen, according to new data released Sunday by the state's Health Department.

The state recorded 49,685 new cases after administering a record 473,076 tests, the Health Department said. There were 468 new fatalities on Sunday, according to the Health Department.

All metrics were over 1% increases from the previous day, the health data showed. Since the start of the pandemic, California has 2,670,962 confirmed cases of COVID-19 and 29,701 deaths, the Health Department said.

As of Jan. 9, 734,405 coronavirus vaccine doses have been administered, according to the Health Department.

The United Kingdom saw another day of rising coronavirus cases, deaths and hospitalizations, according to the British government.

The nation recorded 54,940 new cases Sunday, bringing the total number of cases to 3,072,349, the health data showed. The seven-day average for new cases rose from 21,698 on Dec. 10 to 61,106 on Jan. 1, the British government said.

The U.K. saw 563 new COVID-19-related fatalities Sunday, according to the health data. The country has 81,431 total deaths since the start of the pandemic, the government said.

There are currently 32,294 people hospitalized in Britain. The seven-day average for new hospital admissions rose from 1,728 on Dec. 10 to 3,345 on Jan. 1, officials said.

The Strategic Advisory Group of Experts (SAGE), an advisory group to the World Health Organization, updated its guidance for the Pfizer/BioNTech COVID-19 vaccine Tuesday.

SAGE's recommendations to the WHO director-general, who will ultimately decide whether to approve them, included recommending two doses of the Pfizer vaccine within 21-28 days, with provisions made for countries in extraordinary circumstances.

The group also recommended that that vaccine only be given in settings where allergic reactions can be treated. Since there's not yet enough safety data available on pregnant women, the group only recommends the vaccine for pregnant women in settings where benefits outweigh risks, such as for pregnant health care workers who are exposed to the virus.

People who have had COVID-19 and recovered should get vaccinated, according to SAGE.

"We are in a race to save lives right now," Dr. Tedros Adhanom Ghebreyesus, director-general of the World Health Organization, said Tuesday. "Caseloads are so high in several countries that hospitals and intensive care units are filling up to dangerous levels."

"New variants, which appear to be more transmissible, are exacerbating the situation," Tedros added.

-ABC News' Christine Theodorou contributed to this report.