FILE - In this Friday, Feb. 19, 2021 file photo, Pfizer CEO Albert Bourla speaks at a Pfizer manufacturing site, in Portage, Mich. Bourla is participating along with Dr. Anthony Fauci, soprano Renee Fleming, the CEO of Moderna and the lead guitarist of Aerosmith among others in a unique three-day Vatican conference starting Thursday, May 6, 2021, on COVID-19, other global health threats and how science, solidarity and spirituality can address them. (AP Photo/Evan Vucci)

Gov. Jay Inslee, right, speaks to principal engineer Scott Gibson about the Microgrid batteries Tuesday, April 20, 2021, in Arlington, Wash. (Olivia Vanni/The Herald via AP)

A health worker gives a shot of the Pfizer vaccine for COVID-19 at a community medical center in Sao Paulo, Brazil, Thursday, May 6, 2021. (AP Photo/Andre Penner)

FILE - In this April 13, 2021 file photo, Dr. Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases, speaks during a press briefing at the White House, in Washington. Fauci is participating along with soprano Renee Fleming, the CEOs of Pfizer and Moderna and the lead guitarist of Aerosmith among others in a unique three-day Vatican conference starting Thursday, May 6, 2021, on COVID-19, other global health threats and how science, solidarity and spirituality can address them. (AP Photo/Patrick Semansky, file)

European Union Health Commissioner Stella Kyriakides speaks during a media conference on an EU strategy on COVID-19 therapeutics at EU headquarters in Brussels, Thursday, May 6, 2021. (Kenzo Tribouillard, Pool via AP)

FILE - In this April 30, 2021, file photo, guests walk along the Main Street USA at Disneyland in Anaheim, Calif. Los Angeles and San Francisco are reopening more businesses under California's least restrictive coronavirus safety rules, even though they have more infections than many other big counties, state data shows. (AP Photo/Jae C. Hong, File)

FILE — In this March 29, 2021, file photo, a health care worker steps out of a mobile vaccination van parked on a street corner in the Sunset Park neighborhood of Brooklyn, in New York. New York City hopes to begin offering coronavirus inoculations to tourists by stationing vaccination vans in Times Square and other visitor-heavy spots, Mayor Bill de Blasio said Thursday, May 6, 2021. (AP Photo/Kathy Willens, File)

Passengers wearing face masks arrive to board departing flights at the Tribuvan International airport in Kathmandu, Nepal, Thursday, May 6, 2021. Thousands of passengers rushed to leave Nepal as the Himalayan nation halts all international flights from Thursday because of spiking cases of COVID-19. (AP Photo/Niranjan Shrestha)

Palestinian doctors wearing protective medical gear walk out of the intensive care unit of the Gaza European Hospital, in the Gaza Strip, Thursday, May 6, 2021. (AP Photo/Khalil Hamra)

Ankara Mayor Mansur Yavas, center, and his advisors, wearing masks to help protect against the spread of coronavirus, speak in Ankara, Turkey, Thursday, May 6, 2021. Turkish security forces continue patrolling main streets and set up checkpoints at entry and exits points of cities to enforce Turkey's strictest COVID-19 lockdown to date.(AP Photo/Burhan Ozbilici)

A statue of playwright and performer George M. Cohan stands in New York's Times Square in front of billboards for Broadway shows, Thursday, May 6, 2021. Gov. Andrew Cuomo has announced that Broadway theaters can reopen Sept. 14, 2021. (AP Photo/Mark Lennihan)

FILE - In this July 8, 2013 file photo, Pope Francis speaks to migrants, some wearing white caps, during his visit to the island of Lampedusa, southern Italy. Pope Francis on Thursday, May 6, 2021 denounced “aggressive” nationalism that rejects migrants and demanded that Catholics follow the Gospel-mandated call for an inclusive, welcoming church that doesn’t distinguish between “natives and foreigners, residents and guests.” (AP Photo/Alessandra Tarantino, pool )

A woman wearing protective face mask walks outside of a closed cafe amid COVID-19 pandemic restrictions government in central capital Nicosia, Cyprus, Thursday, May 6, 2021. Cyprus has unveiled a phased rollback of COVID-19 lockdown restrictions over the next month including a shortened curfew and a reopening of all schools next week, but will enforce the compulsory display of proof of vaccination, virus testing or convalescence from the disease in areas were people gather in numbers, including restaurants and churches. (AP Photo/Petros Karadjias)

FILE - In this March 25, 2021, file photo, a "No Olympics" banner is placed by protesters in Tokyo during a demonstration against the going ahead of the Tokyo 2020 Olympic and Paralympic Games. An online petition calling for the Tokyo Olympics to be canceled has gained ten of thousands of signatures since being launched in Japan just a few days ago. The rollout comes with Tokyo, Osaka and several other areas under a state of emergency with coronavirus infections rising — particularly new variants. (AP Photo/Hiro Komae, File)

A man, left, with a skate and a woman, right, wearing protective face masks pass at an empty road amid COVID-19 pandemic restrictions government in central capital Nicosia, Cyprus, Thursday, May 6, 2021. Cyprus has unveiled a phased rollback of COVID-19 lockdown restrictions over the next month including a shortened curfew and a reopening of all schools next week, but will enforce the compulsory display of proof of vaccination, virus testing or convalescence from the disease in areas were people gather in numbers, including restaurants and churches. (AP Photo/Petros Karadjias)

A man receives a Pfizer COVID-19 vaccine at a new vaccination center run by the Paris' fire brigade in Paris, Thursday, May 6, 2021. France joined the United States on Thursday in supporting an easing of patent and other protection on Covid-19 vaccines that could help poorer countries get more doses and speed the en of the pandemic. (AP Photo/Michel Euler)

Pfizer COVID-19 vaccine doses are pictured at a new giant vaccination center run by the Paris' fire brigades in Paris, Thursday, May 6, 2021. France joined the United States on Thursday in supporting an easing of patent and other protection on Covid-19 vaccines that could help poorer countries get more doses and speed the en of the pandemic. (AP Photo/Michel Euler)

A health worker holds a tray with vials of the Pfizer vaccine for COVID-19 during a priority COVID-19 vaccination program at a community medical center in Sao Paulo, Brazil, Thursday, May 6, 2021. (AP Photo/Andre Penner)

Soccer player Fabian Estoyanoff waits in observation after getting a shot of the Sinovac vaccine for COVID-19 at Centenario Stadium in Montevideo, Uruguay, Thursday, May 6, 2021. (AP Photo/Matilde Campodonico)

FILE - In this Oct. 1, 2016 file photo, sunset is over the Italian Islands of Procida and Ischia in the Bay of Naples, Italy. Italy on Friday will open a mass vaccination campaign on small, remote islands where numbers of residents and health care services are limited. The office of Italy’s virus czar said the campaign would initially target the Aeolian Islands north of Sicily and Isola Capraia off the Tuscan coast. Other remote areas on the mainland _ isolated villages in the Alps and Apennine mountains _ might be targeted with similar campaigns. (AP Photo/Alexander Zemlianichenko)

An elderly woman, who is accompanied by her granddaughter, waits to be inoculated with the AstraZeneca COVID-19 vaccine at a sports stadium in Asuncion, Paraguay, Thursday, May 6, 2021. (AP Photo/Jorge Saenz)

FILE - In this Jan. 26, 2021 file photo, Minnesota Gov. Tim Walz takes off his University of Minnesota cloth face mask to answer a question from a reporter during a press conference in St. Paul, Minnesota will lift nearly all its COVID-19 restrictions just before Memorial Day weekend and drop its statewide mask requirement once 70% of residents age 16 and older get their first dose of vaccine, but no later than July 1, Gov. Walz announced Thursday, May 6. (Anthony Souffle/Star Tribune via AP)

A woman walks past the Walter Kerr Theatre, Thursday, May 6, 2021, in New York where Hadestown was showing before the coronavirus pandemic forced its closing a year ago. Gov. Andrew Cuomo has announced that Broadway theaters can reopen Sept. 14, 2021. (AP Photo/Mark Lennihan)

A COVID-19 patient covered under a blanket receives oxygen outside an emergency ward as she waits for a bed to be allotted at a hospital in Kathmandu, Nepal, Thursday, May 6, 2021. Nepal's main cities and towns including the capital Kathmandu has been in lockdown since last month as the number coronavirus cases and deaths continue to rise. (AP Photo/Niranjan Shrestha)