A sign points the way to administrate a dose of the Pfizer COVID-19 vaccine at London Middle School in Wheeling, Ill., Friday, June 11, 2021. After nearly 15 months of shutdowns, limited capacity and sheltering at home, the State of Illinois, including Chicago, fully reopened today. Businesses still can have their own rules for capacity, masks and social distancing. Masks are still required on public transportation and in airports, schools and hospitals. (AP Photo/Nam Y. Huh)

A government employee receives the Convidecia COVID-19 vaccine from a paramedic at a vaccination center in Nishtar hall, in Peshawar, Pakistan, Friday, June11, 2021. (AP Photo/Muhammad Sajjad)

A protester dressed in a protective suit holds slogans during a rally against the G7 summit outside the British Embassy in Taguig, Philippines on Friday, June 11, 2021. The group called on G7 Summit member nations for debt cancellation for poor countries facing difficulties due to the COVID-19 pandemic. (AP Photo/Aaron Favila)

Students and parents wear mask as they wait to receive a second dose of the Pfizer COVID-19 vaccine during a vaccination clinic hosted by Jewel Osco at London Middle School in Wheeling, Ill., Friday, June 11, 2021. After nearly 15 months of shutdowns, limited capacity and sheltering at home, the State of Illinois, including Chicago, fully reopened today. Businesses still can have their own rules for capacity, masks and social distancing. Masks are still required on public transportation and in airports, schools and hospitals. (AP Photo/Nam Y. Huh)

Palestinian hikers approach the Deir Qalaa, "Monastery of the Castle," the remains of a Byzantine monastery, over looking the West Bank village of Deir Ballout, background, west of Salfit, Friday, June. 11, 2021. A growing number of Palestinians are taking up hiking, which offers a way to explore the countryside and historical landmarks in the Israeli-occupied West Bank. (AP Photo/Nasser Nasser)

People carry their child wearing face masks to help curb the spread of the coronavirus head to a kindergarten in Beijing on June 9, 2021. If China is to meet its tentative goal of vaccinating 80% of its population against the coronavirus by the end of the year, tens of millions of children may have to start rolling up their sleeves. (AP Photo/Andy Wong)

A volunteer carries containers with rice, chicken and salad to be given to residents at the San Antonio de Padua soup kitchen in the Petare neighborhood of Caracas, Venezuela, Thursday, June 10, 2021, amid the new coronavirus pandemic. (AP Photo/Ariana Cubillos)

FILE - This Saturday, March 6, 2021 file photo shows vials of Johnson & Johnson COVID-19 vaccine at a pharmacy in Denver. On Thursday, June 10, 2021, Johnson & Johnson said that the U.S. Food and Drug Administration extended the expiration date on millions of doses of its COVID-19 vaccine by an extra six weeks. (AP Photo/David Zalubowski, File)

Eleven Alvarez poses for friends after graduating as a nutritionist, at a park amid the COVID-19 pandemic in Buenos Aires, Argentina, Wednesday, June 2, 2021. (AP Photo/Natacha Pisarenko)

Eighty seven year old Catherine Daries receives her first dose of the Pfizer COVID-19 vaccine at a vaccination center, at the Karl Bremer Hospital, in Cape Town, South Africa, Friday, June 11, 2021. South Africa technically entered the third wave of coronavirus infections as the national seven-day moving average incidence now exceeds the new wave threshold as defined by the Ministerial Advisory Committee. (AP Photo/Nardus Engelbrecht)

People exercise at a park amid the COVID-19 pandemic in Buenos Aires, Argentina, Wednesday, June 2, 2021. (AP Photo/Natacha Pisarenko)

Hikers explore Deir Qalaa, "Monastery of the Castle," the remains of a Byzantine monastery near the Jewish settlement of Peduel and the Palestinian village of Deir Balout, west of the West Bank city of Salfit, Friday, June. 11, 2021. A growing number of Palestinians are taking up hiking, which offers a way to explore the countryside and historical landmarks in the Israeli-occupied West Bank. (AP Photo/Nasser Nasser)

A medial personal prepares the Moderna coronavirus vaccine for members of local fire departments at a temporary mass vaccination center at a former Tsukiji fish market site set up by Tokyo metropolitan government in Tokyo Tuesday, June 8, 2021. Tsukiji site will be a facility which houses and manages vehicles related to the Tokyo 2020 Games. (AP Photo/Eugene Hoshiko)

Ambulance Doctor Vladimir Canal enters a home to attend a COVID-19 patient with oxygen problems after an emergency call to the residence during his night shift in Lomas de Zamora, Argentina, late Thursday, June 10, 2021. (AP Photo/Natacha Pisarenko)

Gov. Gavin Newsom presents a check to Nancy Gutierrez, the winner of $50K lottery for getting vaccinated as Assemblywoman Tasha Boerner Horvath, right looks on in San Diego, Calif. on Friday, June 11, 2021. (AP Photo/Elliot Spagat)

Visitors take a break outside the Louvre Museum courtyard, in Paris, Wednesday, June 9, 2021. France is back in business as a tourist destination after opening its borders Wednesday to foreign visitors who are inoculated against the coronavirus with vaccines approved by the European Union's medicines agency. France's acceptance of only the Pfizer, Moderna, AstraZeneca and Johnson & Johnson vaccines means that tourism is still barred for would-be visitors from China and other countries that use other vaccines. (AP Photo/Francois Mori)

FILE - In this Tuesday, Dec. 15, 2020 file photo, a droplet falls from a syringe after a health care worker was injected with the Pfizer-BioNTech COVID-19 vaccine at a hospital in Providence, R.I. According to a report by researchers from Johns Hopkins University published in the Annals of Internal Medicine on Monday, June 14, 2021, a small study offers the first hint that an extra dose of COVID-19 vaccines just might give some organ transplant recipients a needed boost in protection. (AP Photo/David Goldman, File)

People cross a street as they make their way towards Chicago's Wrigley Field during baseball game, Friday, June 11, 2021, as Chicago and rest of Illinois fully reopens ending an over a year-long COVID-19 restrictions. (AP Photo/Shafkat Anowar)

Kids play around a water fountain outside of Chicago's Wrigley Field before a baseball game, Friday, June 11, 2021, as Chicago and rest of Illinois fully reopens ending an over a year-long COVID-19 restrictions. (AP Photo/Shafkat Anowar)

California Gov. Gavin Newsom smiles during a news conference in San Francisco, on Thursday, June 3, 2021. California Gov. Gavin Newsom has signed an executive order that will lift most of the state's coronavirus rules. The order Newsom signed Friday, June 11, 2021, takes effect on Tuesday. It will end the state's stay-at-home order and its various amendments. (AP Photo/Eric Risberg)

FILE - In this Oct. 2, 2020, file photo, a man sits on Waikiki Beach in Honolulu. Honolulu is loosening some restrictions on social activity now that more than half its population has been vaccinated against COVID-19. The new rules allow outdoor social gatherings of up to 25 people and indoor gatherings of up to 10.(AP Photo/Caleb Jones, File)

Britain's Health Secretary Matt Hancock leaves 10 Downing Street, in London, Monday, June 7, 2021. Hancock said Sunday the delta variant, which is fast becoming the dominant coronavirus variant in the U.K., is 40% more transmissible compared to the country's existing strains. (AP Photo/Matt Dunham)