Cruise ship MSC Orchestra passes in the Giudecca Canal in Venice, Italy, early Thursday, June 3, 2021. Early risers in Venice woke Thursday to the sight of a cruise ship traveling down the Giudecca canal for the first time since the pandemic, despite pledges by subsequent Italian governments to reroute the huge vessels due to safety and environmental concerns. (JC Viens via AP)

FILE - In this May 14, 2021, file photo, a worker wears a mask while prepares desserts at the Universal City Walk, in Universal City, Calif. California workplace regulators are considering Thursday, June 3, 2021, whether to end mask rules if every employee in a room has been fully vaccinated against the coronavirus, frustrating business groups by eying a higher standard than the state plans to soon adopt for social settings. (AP Photo/Marcio Jose Sanchez, File)

California Gov. Gavin Newsom points toward California Restaurant Association President & CEO Jot Condie, left, as Condie's daughter Gabriella, 10, looks on after a news conference outside Tommy's Mexican Restaurant in San Francisco, on Thursday, June 3, 2021. The governor offered his support at the news conference for the extension and expansion of outdoor dining and take-out cocktails. (AP Photo/Eric Risberg)

Vice President Kamala Harris listens as President Joe Biden speaks about the COVID-19 vaccination program, in the South Court Auditorium on the White House campus, Wednesday, June 2, 2021, in Washington. (AP Photo/Evan Vucci)

Indian man Himanshu, wearing personal protective suit as a precaution against the coronavirus distributes free aid procured by him to people living in a small island in River Yamuna in New Delhi, India, Wednesday, June 2, 2021. (AP Photo/Amit Sharma)

A woman, wearing a protective face mask as a precaution against the spread of the new coronavirus, walks past in Havana, Cuba, Wednesday, June 2, 2021. (AP Photo/Ramon Espinosa)

An elderly woman with a young child queues to receive her Pfizer COVID-19 vaccine, at a clinic at Orange Farm, near Johannesburg, Thursday, June 3, 2021. South Africa began vaccinating its elderly citizens nearly three weeks ago. (AP Photo/Denis Farrell)

A health worker picks syringes as seniors get vaccinated with the first dose of the Pfizer coronavirus vaccine at the newly-opened mass vaccination program for the elderly at a drive-thru vaccination center in Johannesburg, South Africa, Tuesday, May 25, 2021. (AP Photo/Themba Hadebe)

FILE - In this May 20, 2021, file photo, a bartender wears a mask while working at an outdoor bar amid the COVID-19 pandemic, at The Grove in Los Angeles. California workplace regulators are considering Thursday, June 3, 2021, whether to end mask rules if every employee in a room has been fully vaccinated against the coronavirus, frustrating business groups by eying a higher standard than the state plans to soon adopt for social settings. (AP Photo/Marcio Jose Sanchez, File)

Residents walk by a vaccination center in Beijing on Wednesday, June 2, 2021. After a slow start, China is now doing what virtually no other country in the world can: harnessing the power and all-encompassing reach of its one-party system and a maturing domestic vaccine industry to administer shots at a staggering pace. (AP Photo/Ng Han Guan)

Residents wearing face masks to help curb the spread of the coronavirus line up to receive the Sinopharm COVID-19 vaccine at the Central Business District in Beijing, Wednesday, June 2, 2021. (AP Photo/Andy Wong)

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

Relatives of COVID-19 patients camp outside the Ingavi Hospital in San Lorenzo, Paraguay, Wednesday, June 2, 2021. The relatives maintain a round-the-clock vigil to provide the food and medicines for their hospitalized family members. (AP Photo/Jorge Saenz)

A migrant receives the Johnson and Johnson COVID-19 vaccine by a member of staff from the National Health Organisation (EODY), at Karatepe refugee camp, on the northeastern Aegean island of Lesbos, Greece, Thursday, June 3, 2021. Vaccinations started Thursday for people over 18 years old in migrant camps on the Greek islands. (AP Photo/Panagiotis Balaskas)

A health worker administers the AstraZeneca vaccine during a special vaccination drive for autorickshaw and cab drivers in Hyderabad, India, Thursday, June 3, 2021. (AP Photo/Mahesh Kumar A.)

A girl gets a Pfizer BioNTech COVID-19 vaccine in Bucharest, Romania, Wednesday, June 2, 2021. Romania has started the vaccination campaign for children between the ages of 12 and 15. (AP Photo/Andreea Alexandru)

An elderly woman is assisted after receiving her Pfizer COVID-19 vaccine, at a clinic at Orange Farm, near Johannesburg, Thursday, June 3, 2021. South Africa began vaccinating its elderly citizens nearly three weeks ago. (AP Photo/Denis Farrell)

A migrant receives the Johnson and Johnson vaccine against COVID-19 by a medical staff of the National Health Organisation (EODY), at Karatepe refugee camp, on the northeastern Aegean island of Lesbos, Greece, Thursday, June 3, 2021. Vaccinations started Thursday for people over 18 years old in migrant camps on the Greek islands. (AP Photo/Panagiotis Balaskas)

Medical assistant Andreea Marian, right, gives a COVID-19 vaccine to Gabina Morales at a clinic at PeaceHealth St. Joseph Medical Center Thursday, June 3, 2021, in Bellingham, Wash. Washington is the latest state to offer prizes to encourage people to get vaccinated against COVID-19, with Gov. Jay Inslee on Thursday announcing a series of giveaways during the month of June that includes lottery drawings totaling $2 million, college tuition assistance, airline tickets and game systems. (AP Photo/Elaine Thompson)

A Croatian border police office inspects travel documents at the border crossing between Croatia and Slovenia, in Bregana, Wednesday, June 2, 2021. The European Union wants to revamp Europe's ID check-free travel area after coronavirus restrictions placed new strains on tourism and business travel throughout the bloc. (AP Photo/Darko Bandic)