A sign requiring masks is displayed as travelers move about at Cleveland Hopkins International Airport, Wednesday, May 26, 2021, in Cleveland. (AP Photo/Tony Dejak)

A demonstrator holds an image of the Brazilian flag covered in fake blood and the Portuguese phrase "Bolsonaro Genocide" during an anti-government protest by unions against President Jair Bolsonaro's policies to fight the COVID-19 pandemic in Brasilia, Brazil, Wednesday, May 26, 2021. (AP Photo/Eraldo Peres)

Workers with Peninsula Community Health Services, give patients the first shot of the Pfizer COVID-19 vaccine, Tuesday, May 25, 2021, in the galley area of a Washington state ferry sailing from Bremerton, Wash. to Seattle. Tuesday was the first day of several dates that the vaccine would be offered to people on ferry sailings between the two cities. (AP Photo/Ted S. Warren)

Commuters wearing face masks to help prevent the spread of the coronavirus wait for rides in Quezon City, Philippines on Monday, May 24, 2021. The Philippines, a coronavirus hotspot in Southeast Asia, has received more than eight million doses of COVID-19 vaccine since February, but less than half have been administered so far, said officials, adding that among the problems were public hesitancy and low registration for the jabs. (AP Photo/Aaron Favila)

People who arrived early in the morning to get inoculated against the coronavirus wait their turn at a vaccination camp for those above age 45 being held in the premises of a school in Bengaluru, India, Wednesday, May 26, 2021. (AP Photo/Aijaz Rahi)

Timothy Musomba wears a mask while viewing sculptures at the newly re-opened Getty Center amid the COVID-19 pandemi,c Wednesday, May 26, 2021, in Los Angeles. (AP Photo/Marcio Jose Sanchez)

A man holds a sign that reads in Spanish "74.000 deaths" as he attends a protest against how the government of President Alberto Fernandez is handling the new coronavirus pandemic crisis, in Buenos Aires, Argentina, Tuesday, May 25, 2021. (AP Photo/Marcos Brindicci)

Signs requiring masks if not vaccinated against COVID-19 are displayed as National Institutes of Health Director Francis Collins, Sen. Roy Blunt, R-Mo., Dr. Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases, and Diana Bianchi, director of the Eunice Kennedy Shriver National Institute of Child Health and Human Development, speak after a Senate Appropriations Subcommittee looking into the budget estimates for National Institute of Health (NIH) and the state of medical research, Wednesday, May 26, 2021, on Capitol Hill in Washington. (Stefani Reynolds/Pool via AP)

Health workers wearing Personal Protective Equipment (PPE) sanitize during the funeral for a COVID-19 victim at Nirvana memorial, a Buddhist, Taoist and Christian cemetery in Semenyih, Malaysia, Wednesday, May 26, 2021. Malaysia's latest coronavirus surge has been taking a turn for the worse as surging numbers and deaths have caused alarm among health officials, while cemeteries in the capital are dealing with an increasing number of deaths. (AP Photo/Vincent Thian)

Local vendors sell pork meat and vegetables on a sidewalk as the main market remained closed during a lockdown, following a battling against a surge of COVID-19 cases, in downtown Phnom Penh, Cambodia, Wednesday, May 26, 2021. (AP Photo/Heng Sinith)

A mural of Mexican revolutionary hero Emiliano Zapata decorates the Jacinto Perez lutherie school where Jose Luis Reyna teaches students to build their own traditional Venezuelan instrument called "el cuatro" in the 23 de Enero neighborhood of Caracas, Venezuela, Wednesday, May 26, 2021. Due to the COVID-19 pandemic lockdown, students can only come every other week to work on their instruments, making the process much slower. (AP Photo/Matias Delacroix)

Nurse Meltem Gulcan, left, talks to local residents about the importance of anti COVID-19 vaccination, in the village of Gokce, in the district of Mardin, a culturally and historically diverse region in Turkey's south, overlooking Mesopotamia and bordering Syria, Friday, May 21, 2021. The health worker is part of Turkey's 'vaccination persuasion' teams, a recent initiative that aims to promote inoculation against the coronavirus among the country's most vulnerable population. (AP Photo/Mehmet Guzel)