FILE - In this Nov. 12, 2015, file photo, Mt. Everest is seen from the way to Kalapatthar in Nepal. China will draw a “separation line” atop Mount Everest to prevent the coronavirus from being spread by climbers ascending Nepal's side of the mountain, Chinese state media reported Monday. (AP Photo/Tashi Sherpa, File)

FILE - This Sept. 9, 2016, file photo shows Harkness Tower on the campus of Yale University in New Haven, Conn. Yale University is requiring its faculty and staff to get coronavirus vaccinations before the 2021 fall term, extending a requirement already imposed for students. The private university says faculty members, staffers and academic trainees must be fully inoculated by Aug. 1, 2021, although there are provisions for exemptions for reasons based on medical conditions or religious or “strongly held” personal beliefs. (AP Photo/Beth J. Harpaz, File)

A health worker takes the nasal swab sample of a boy to test for COVID-19 in Gauhati, India, Friday, May 14, 2021. (AP Photo/Anupam Nath)

FILE - IN this Dec. 21, 2020 file photo, A family walks past Cinderella Castle in the Magic Kingdom, at Walt Disney World in Lake Buena Vista, Fla. Florida's major theme parks are adjusting their face mask policies after the federal government loosened its recommendations as more people get vaccinated for the coronavirus. Visitors to Walt Disney World and Universal Studios-Orlando were allowed Saturday, May 15, 2021 to remove their masks when they are outdoors except when they are on attractions, in line or riding a tram or other transportation.(Joe Burbank/Orlando Sentinel via AP, File)

A man walks past a mural on how to wear a face mask to prevent the spread of coronavirus, in Soweto, South Africa, Saturday, May 15, 2021. (AP Photo/Themba Hadebe)

The employee of a pub rolls a stack of chairs onto the market place in Heidelberg, Germany, Saturday, May 15, 2021. After months of lockdown, the Southwest is loosening the reins on Corona rules significantly. From Saturday on, openings in gastronomy, tourism and leisure are possible. (Uwe Anspach/dpa via AP)

A woman enjoys the sun at Plaka beach on the Aegean island of Naxos, Greece, Friday, May 14, 2021. Greece launched its tourism season Friday amid a competitive scramble across the Mediterranean to lure vacationers emerging from lockdowns. (AP Photo/Thanassis Stavrakis)

Noah Chen, 13, gets a shot of the Pfizer COVID-19 vaccine at the First Baptist Church of Pasadena, Friday, May 14, 2021, in Pasadena, Calif. (AP Photo/Marcio Jose Sanchez)

Doctors protest for better working conditions and resources to fight the COVID-19 pandemic in Asuncion, Paraguay, Friday, May 14, 2021. (AP Photo/Jorge Saenz)

Family member, right, of a person who died of COVID-19 performs Hindu rituals in Prayagraj, India, Saturday, May 15, 2021. India's Prime Minister Narendra Modi on Friday warned people to take extra precautions as the virus was spreading fast in rural areas. (AP Photo/Rajesh Kumar Singh)

Indian Christian priests offer prayers next to the coffin of Father Rolfie D'Souza's who died of COVID-19, at a cemetery in Prayagraj, India, Saturday, May 15, 2021. India's Prime Minister Narendra Modi on Friday warned people to take extra precautions as the virus was spreading fast in rural areas. (AP Photo/Rajesh Kumar Singh)

Rose petals are spread around the grave and coffin of Father Rolfie D'Souza's who died of COVID-19, at a cemetery in Prayagraj, India, Saturday, May 15, 2021. India's Prime Minister Narendra Modi on Friday warned people to take extra precautions as the virus was spreading fast in rural areas. (AP Photo/Rajesh Kumar Singh)

People wait in a converted underground car park vaccination centre in Ebersberg near Munich, Germany, Saturday, May 15, 2021. Hundreds of people have lined up at an improvised vaccination center near Munich to get one of 1,000 doses of the AstraZeneca coronavirus vaccine that were on offer. Police said that around 850 people were standing in line at around 10 a.m. -- and some of them had arrived as early as 5 a.m. (AP Photo/Matthias Schrader)

A Nepalese woman and her daughter wearing face masks as a precaution against the coronavirus watch devotees pull a chariot during the Rato Machindranath chariot festival in Lalitpur, Nepal, Saturday, May 15, 2021. A truncated version of a Hindu chariot festival took place in Nepal's capital on Saturday amid strict COVID-19 restrictions, following an agreement between organizers and authorities that prevented a repeat of violent confrontations between police and protesters at last year's festival. (AP Photo/Niranjan Shrestha)

People gather next to the Lachine Canal on a warm spring day in Montreal, Saturday, May 15, 2021, as the COVID-19 pandemic continues in Canada and around the world. (Graham Hughes/The Canadian Press via AP)

A woman holds an umbrella prior to a protest against COVID-19 restriction measures at the Bois de la Cambre park in Brussels, Saturday, May 15, 2021. (AP Photo/Francisco Seco)

People queue at a vaccination centre in Ebersberg near Munich, Germany, Saturday, May 15, 2021. Hundreds of people have lined up at an improvised vaccination center near Munich to get one of 1,000 doses of the AstraZeneca coronavirus vaccine that were on offer. Police said that around 850 people were standing in line at around 10 a.m. -- and some of them had arrived as early as 5 a.m. (AP Photo/Matthias Schrader)

People wear face masks to protect against the spread of the coronavirus after the COVID-19 alert raise to level 3 in Taipei, Taiwan, Saturday, May 15, 2021. Taiwan, which has had enviable success in containing COVID-19, imposed new restrictions in its capital city on Saturday as it battled its worst outbreak since the pandemic began. (AP Photo/Chiang Ying-ying)

Bodies of suspected coronavirus victims are seen in shallow graves buried in the sand near a cremation ground on the banks of Ganges River in Prayagraj, India, Saturday, May 15, 2021. (AP Photo/Rajesh Kumar Singh)