A health worker shows an empty syringe after inoculating a woman with AstraZeneca's COVID-19 vaccine during the first day of a nationwide three-day vaccination drive at a school in Quezon city, Philippines on Monday, November 29, 2021. There has been no reported infection so far caused by the new variant in the Philippines, a Southeast Asian pandemic hotspot where COVID-19 cases have considerably dropped to below 1,000 each day in recent days, but the emergence of the Omicron variant has set off a new alarm. (Photo by Aaron Favila/AP Photo)

Tobias Mueller of Germany falls as Johannes Aujesky of Austria competes in the Men's Ski Cross of Audi FIS Cross World Cup 2022 at Genting snow park on November 27, 2021 in Zhangjiakou, China. (Photo by Lintao Zhang/Getty Images)

Revellers make the most of Boxing Day in Liverpool city centre, United Kingdom on Sunday, December 26, 2021. Boxing Day is a holiday celebrated after Christmas Day, occurring on the second day of Christmastide. (Photo by London News Pictures)

A Chinese tourist visits the Mutianyu Great Wall covered in snow on February 23, 2021 in Beijing, China. Affected by the new coronavirus (COVID-19), the number of visitors to Mutianyu Great Wall in 2020 dropped by about 60%. (Photo by Lintao Zhang/Getty Images)

Mailin Gobbo reacts as she leaves the courtroom after hearing a judge acquit former Catholic Priest Carlos Eduardo Jose, who she says sexually abused her for years when she was an adolescent, in San Martin, Argentina, Tuesday, March 9, 2021. The court acquitted the 62-year-old, citing the statute of limitations had run out. (Photo by Natacha Pisarenko/AP Photo)

A winter swimming enthusiast dives into a partly frozen lake in a partly frozen lake in Shenyang, in northeastern China's Liaoning province on January 25, 2022. (Photo by AFP Photo/China Stringer Network)

A worshipper prays during the Friday prayer at the Great Mosque in Ouagadougou, on January 28, 2022. Burkina Faso, the scene of a military coup on Monday, was suspended from the Community of West African States (ECOWAS) on Friday, following a virtual summit of the organization whose heads of state will meet again on February 3 in Accra to reassess the situation in this country. (Photo by Olympia de Maismont/AFP Photo)

An Egyptian boy rides his donkey in front of a cafeteria with a picture of former Barcelona's forward player Lionel Messi at a village, near Giza, on the outskirts of Cairo, Egypt, February 7, 2022. (Photo by Amr Abdallah Dalsh/Reuters)