A man is administered the Sputnik V COVID-19 vaccine in Bratislava, Slovakia, Monday June 7, 2021. (Jakub Kotian/TASR via AP)

A man wearing a face mask to protect against the spread of the coronavirus walks by posters to promote the Tokyo Olympic Games in Tokyo Monday, June 7, 2021. (AP Photo/Koji Sasahara)

A security guard is inoculated with China's Sinovac COVID-19 vaccine at the Navotas Fish Port, Philippines on Monday, June 7, 2021. The government today bolstered its vaccination program by including frontline economic personnel both in private and government sectors. (AP Photo/Aaron Favila)

A woman wearing a face mask with the words "Gaokao, must win" as students take part on the first day of China's national college entrance examinations, known as the gaokao, in Beijing, Monday, June 7, 2021WLD. More than 10 million high school students throughout China will take the two days annual college entrance exams which start on Monday to Tuesday, according to the state media report. (AP Photo/Andy Wong)

Signage in Marathi on a mannequin draped with a sari reads, "please don't touch" as a shopkeeper offers prayers before an image of Hindu deity Ganesh as he starts his day in Mumbai, India, Monday, June 7, 2021. . Businesses in two of India's largest cities, New Delhi and Mumbai, are reopening as part of a phased easing of lockdown measures in several states now that the number of new coronavirus infections in the country is on a steady decline. (AP Photo/ Rafiq Maqbool)

Cuba's pitcher Yoanni Yera Montalvo, left, throws the ball as his teammates smile watching him during a training session at the Estadio Latinoamericano in Havana, Cuba, Tuesday, May 18, 2021. A little over a week after the start of the Las Americas Baseball Pre-Olympic in Florida, the Cuban team does not have visas to travel to the United States. At second from right is Lazaro Blanco. (AP Photo/Ramon Espinosa)

Students wear face masks to help prevent the spread of the coronavirus in Peshawar, Pakistan, Monday, June 7, 2021. Pakistani authorities reopened educational institutes following a steady decrease in deaths and infections from the coronavirus. (AP Photo/Muhammad Sajjad)

FILE - Gym teacher Becky Ward, center, watches as fifth graders throw frisbees at the Milton Elementary School, Tuesday, May 18, 2021, in Rye, N.Y. Gov. Andrew Cuomo said Monday that students no longer have to wear masks while outdoors on school grounds. But students and staff will still have to wear masks for the rest of the school year. (AP Photo/Mary Altaffer, File)

Health workers administer a dose of the AstraZeneca COVID-19 vaccine to women at Paragon shopping mall in Bangkok, Thailand, Monday, June 7, 2021. Health authorities in Thailand on Monday began their much-anticipated mass rollout of locally produced AstraZeneca vaccine, but it appeared that supplies were falling short of demand from patients who had scheduled vaccinations for this week. (AP Photo/Sakchai Lalit)

Healthcare workers prepare doses of the Sputnik V vaccine for COVID-19 as seniors and those considered high risk for contagion are eligible at a vaccination center set up in the parking lot of the Armed Forces Social Prevision Institute (IPSFA) in Caracas, Venezuela, Monday, June 7, 2021. (AP Photo/Matias Delacroix)

A man carries goods at a street market in Port-au-Prince, Haiti, Saturday, June 5, 2021. Haiti defied predictions and perplexed health officials by avoiding a COVID-19 crisis for more than a year, but the country of more than 11 million people that has not received a single vaccine is now battling a spike in cases and deaths. (AP Photo/Joseph Odelyn)

Tourists arrive at Barcelona airport, Spain, Monday, June 7, 2021. Spain is trying to ramp up its tourism industry by welcoming from Monday vaccinated visitors from most countries, as well as all Europeans who prove that they are not infected with the coronavirus. (AP Photo/Emilio Morenatti)