Revellers in Leeds, United Kingdom were excited to be out and about again on July 18, 2021. At a minute past midnight, England dropped most of its remaining Covid-19 social restrictions, such as those requiring indoor mask-wearing and limits on group gatherings. These changes come despite rising infections, pitting the country's vaccination programme against the virus's more contagious Delta variant. (Photo by Ioannis Alexopoulos/PA Wire Press Association via Getty Images)

Rescuers carry an injured passenger on stretcher at Soshigaya Okura Station after stabbing on a commuter train, in Tokyo Friday night, August 6, 2021. A man with a knife attacked 10 passengers on a commuter train in Tokyo on Friday and was arrested by police after fleeing, fire department officials and news reports said. (Photo by Kyodo News via AP Photo)

A fisherman throws his net beside a half-submerged M/V Palawan Pearl after it collided with a Cyprus-flagged BKM 104 dredger in Manila bay, Philippines on Thursday, July 8, 2021. A Philippine cargo vessel and a Cyprus-flagged dredger collided in a Manila Bay anchorage area early Thursday, resulting in no injuries but causing the cargo vessel to list and lie half-submerged in the busy waters. (Photo by Aaron Favila/AP Photo)

A Hezbollah supporter fires a rocket-propelled grenade in the air to celebrate the arrival of Iranian fuel tankers to Lebanon, in the eastern town of Baalbek, Lebanon, Thursday, September 16, 2021. The delivery violates US sanctions imposed on Tehran after former President Donald Trump pulled America out of a nuclear deal between Iran and world powers three years ago. (Photo by Bilal Hussein/AP Photo)

Guests watch “Trolls World Tour”, in the rain at the Four Brothers Drive In Theatre amid the coronavirus pandemic, Friday, May 15, 2020, in Amenia, N.Y. (Photo by John Minchillo/AP Photo)

A child of a migrant worker drinks water as his mother holds him while waiting in a queue for transport to reach to a railway station to board a train to their home state of northern Uttar Pradesh, after a limited reopening of India's giant rail network following a nearly seven-week lockdown to slow the spreading of the coronavirus disease (COVID-19), in Ahmedabad, India, May 15, 2020. (Photo by Amit Dave/Reuters)

A volunteer tries out a protective suits for health workers, at the International Islamic University Malaysia in Gombak, outskirts of Kuala Lumpur, Malaysia Friday, April 10, 2020. The Malaysian government issued a restricted movement order to the public for the rest of the month to help curb the spread of the new coronavirus. (Photo by Vincent Thian/AP Photo)

This photo taken on May 20, 2020 shows elementary school students wearing wings to maintain social distancing amid concerns of the COVID-19 coronavirus, in a classroom in Taiyuan in China's northern Shanxi province. (Photo by AFP Photo/China Stringer Network)