Kevin Fisher, of Quincy, Mass., left, receives his second shot of Moderna COVID-19 vaccine from RN Katherine Francisco, of Avon, Mass., right, at a mass vaccination clinic, Wednesday, May 19, 2021, at Gillette Stadium, in Foxborough, Mass. A month after every adult in the U.S. became eligible for the vaccine, a distinct geographic pattern has emerged: The highest vaccination rates are concentrated in the Northeast, while the lowest ones are mostly in the South. (AP Photo/Steven Senne)

French robot "Pepper the droid" looks at the signal from a staff member at the exhibition "Robots – The 500-Year Quest to Make Machines Human" in the Hong Kong Science Museum, Wednesday, May 19, 2021. (AP Photo/Kin Cheung)

FILE - In this May 2, 2021, file photo, Stephanie Birman, right, a Seattle Sounders season ticket holder, wears a Sounders mask, jersey and earrings as she gets the Johnson & Johnson COVID-19 vaccine at a clinic in a concourse at Lumen Field prior to an MLS soccer match between the Sounders and the Los Angeles Galaxy. On Thursday, May 20, 2021, authorities in King County, Wash., which includes Seattle, said all people should continue wearing masks indoors until 70% of people in the county 16 and older are fully vaccinated. (AP Photo/Ted S. Warren, File)

A Nepalese woman and her daughter wearing face masks as a precaution against the coronavirus watch devotees pull a chariot during the Rato Machindranath chariot festival in Lalitpur, Nepal, Saturday, May 15, 2021. A truncated version of a Hindu chariot festival took place in Nepal's capital on Saturday amid strict COVID-19 restrictions, following an agreement between organizers and authorities that prevented a repeat of violent confrontations between police and protesters at last year's festival. (AP Photo/Niranjan Shrestha)

A bartender wears a mask while working at an outdoor bar amid the COVID-19 pandemic Thursday, May 20, 2021, at The Grove in Los Angeles. California regulators will shoot for a mid-June easing of workplace masking and social distancing requirements to conform with a broader state order. They asked to delay a debate Thursday on how quickly they should drop coronavirus safety rules for employees. (AP Photo/Marcio Jose Sanchez)

James Martin discusses his hesitancy to get a COVID-19 vaccine while stopping at a store in Clanton, Ala., on Wednesday, May 19, 2021. Martin said he doesn’t trust the vaccines because of the speed with which they were developed and a lack of knowledge about long-term effects. (AP Photo/Jay Reeves)

A medical worker collects a swab sample from a woman during coronavirus testing at a COVID-19 testing center in Ulu Klang, on the outskirts of Kuala Lumpur, Malaysia, Tuesday, May 18, 2021. (AP Photo/Vincent Thian)

Project Hope Crisis Counselor Danielle Iorlano, right, talks to Arlene Rappaport and other members of her family during the observation period after Arlene was inoculated against the coronavirus in her home in Levittown, N.Y., Thursday, May 20, 2021. Once a week Mount Sinai South Nassau's Vaxmobile staff visit homebound residents to administer the Johnson & Johnson COVID-19 vaccine. (AP Photo/Mary Altaffer)

A health worker administers a dose of the Sinovac COVID-19 vaccine to Zhang Xiaohong, a 40-year-old businessman who runs a logistic company in Thailand, at Bangrak Vaccination and Health Center in Bangkok, Thailand Thursday, May 20, 2021. China began vaccinating its citizens living in Thailand on Thursday as part of a global campaign to inoculate its nationals living and working abroad. (AP Photo/Fu Ting)

A Uniao Quimica pharmaceutical employee works at the company's control center for the Russian Sputnik V COVID-19 vaccine in Guarulhos in the greater Sao Paulo area of Brazil, Thursday, May 20, 2021. The shot still hasn't been approved for use in Brazil, which prompted local partner Uniao Quimica to begin exports throughout Latin America. (AP Photo/Andre Penner)

Vedika Jawa poses with freshly baked desserts inside South Hayward Parish in Fremont, Calif., on Feb. 1, 2021. Jawa, a high school junior, distributes sweets to 15 shelters through a non-profit she started when she was 13. (Rachna Jawa via AP)

The images of those who disappeared during the military dictatorship are displayed in downtown Montevideo, Uruguay, Thursday, May 20, 2021. The annual March of Silence, which honors the disappeared, was suspended for a second year in a row due to the COVID-19 pandemic. (AP Photo/Matilde Campodonico)

People wearing masks to help protect against the spread of coronavirus, walk in Ankara, Turkey, Thursday, May 20, 2021. Turkey's daily COVID-19 infections have dropped to levels last seen in mid-March as the country ended its strictest restrictions on Monday.(AP Photo/Burhan Ozbilici)