Signs guide the public at a large vaccination and testing site as people with preexisting health conditions are granted access to a vaccination during the outbreak of the coronavirus disease (COVID-19) in Inglewood, California, U.S., March 15, 2021.

Stickers that are given to people who have been vaccinated against the coronavirus disease (COVID-19) are pictured in Los Angeles, California, U.S., April 12, 2021.

Faith Walsh, a nurse with the United States Public Health Service, documents a vial of Moderna (COVID-19) vaccine before opening the clinic in Eagle, Alaska, U.S., March 31, 2021.

A medical worker holds Pfizer coronavirus disease (COVID-19) vaccination cards at a mobile vaccination drive for essential food processing workers at Rose & Shore, Inc., in Vernon, Los Angeles, California, U.S., March 17, 2021.

Bernice Bohannon, who turned 111 years old on Sunday, is comforted by nurse Jalissa Hurd following her coronavirus disease (COVID-19) vaccination, at the IU Health Neuroscience Center in Indianapolis, Indiana, U.S. March 16, 2021.

People stand in line at the Jacob K. Javits Convention Center Vaccination Center as Governor Andrew M. Cuomo announces the start of the statewide "Vaccinate NY" ad campaign to encourage all New Yorkers to get vaccinated, in New York City, New York, U.S. April 6, 2021. Timothy A. Clary/Pool via REUTERS

Frankie Webster, 18, receives a (COVID-19) vaccine at the Chief Andrew Isaac Health Center in Fairbanks, Alaska, U.S., March 30, 2021.

Cristian Ram?­rez grimaces while receiving his coronavirus disease (COVID-19) vaccine at a rural vaccination site in Columbus, New Mexico, U.S., April 16, 2021.

People wait to receive coronavirus disease (COVID-19) vaccines at a rural vaccination site in Columbus, New Mexico, U.S., April 16, 2021.

A volunteer assists a man to fill out paperwork before he is vaccinated against the coronavirus disease (COVID-19) at a clinic hosted by the Arab Community Center for Economic and Social Services (ACCESS) in Sterling Heights, Michigan, U.S. April 20, 2021.

Ramiro Medina, 55, receives a coronavirus disease (COVID-19) vaccination at a mobile vaccination drive for essential food processing workers at Rose & Shore, Inc., in Vernon, Los Angeles, California, U.S., March 17, 2021.

People receive their coronavirus disease (COVID-19) vaccines at a mass vaccination site at Lumen Field Event Center in Seattle, Washington, U.S. March 13, 2021.

Holly Archer, 34, is monitored after receiving her coronavirus disease (COVID-19) vaccine as vaccine eligibility expands to anyone over the age of 16 at the Bradfield Community Center through Health Partners of Western Ohio in Lima, Ohio, U.S., March 29, 2021.

A woman working with registration stands inside a vaccination area for people receiving the Johnson & Johnson coronavirus disease (COVID-19) vaccine at a NYC mobile vaccine bus in the Sunset Park section of the Brooklyn borough of New York, U.S., April 7, 2021.

A man wearing a protective face mask walks by a woman working with registration for people receiving the Johnson & Johnson coronavirus disease (COVID-19) vaccine at a NYC mobile vaccine bus in the Sunset Park section of the Brooklyn borough of New York, U.S., April 7, 2021.

A Northewell Health nurse inoculates Local 28 Sheet Metal Worker Demetrius Buttelman with the first dose of the Pfizer vaccine during a news conference, at the pop up vaccination site at Belmont Park in Elmont, New York, U.S., April 14, 2021. Mary Altaffer/Pool via REUTERS

Nursing student Brian Pineda and volunteer Susie Bushnell dance as they welcome people to a vaccination center as California opens up vaccine eligibility to any residents 16 years and older, during the outbreak of coronavirus disease (COVID-19) in Chula Vista, California, U.S., April 15, 2021.

Taras Mychalewych, 75, receives a coronavirus disease (COVID-19) vaccine at a rural vaccination site in Columbus, New Mexico, U.S., April 16, 2021.

Cortney Marengo and her four children set up registration stations for a coronavirus disease (COVID-19) vaccine clinic run by Skippack Pharmacy in Lansdale, Pennsylvania, U.S., April 18, 2021. Marengo is the Volunteer Director of Operations at Skippack Pharmacy and volunteers over fifty hours a week.

People wait to receive their coronavirus disease (COVID-19) vaccine at a clinic ran by Skippack Pharmacy as cases rise in the state in Lansdale, Pennsylvania, U.S., April 18, 2021.

Michelle Melton, who is 35 weeks pregnant, receives the Pfizer-BioNTech vaccine against the coronavirus disease (COVID-19) at Skippack Pharmacy in Schwenksville, Pennsylvania, U.S., February 11, 2021.

Taras Mychalewych, 75, poses for a portrait with his vaccination card after receiving his coronavirus disease (COVID-19) vaccine at a rural vaccination site in Columbus, New Mexico, U.S., April 16, 2021.

Dr. Mayank Amin administers the Pfizer-BioNTech coronavirus disease (COVID-19) vaccine to Helen Pepe, 94, at a clinic ran by Skippack Pharmacy in Collegeville, Pennsylvania, U.S., March 7, 2021.

A woman waits in her car to receive a dose of a coronavirus disease (COVID-19) vaccine at a clinic run by Skippack Pharmacy as cases rise in the state in Lansdale, Pennsylvania, U.S., April 18, 2021.

Musicians Angela Lehman and Matt Gold play as people receive the coronavirus disease (COVID-19) vaccines in Richmond, Virginia, U.S., March 24, 2021.

Idalia Vazquez, 83, receives her second shot of coronavirus disease (COVID-19) vaccine from Helen Turchioe, (L) who is part of a team of vaccinators administering shots to homebound seniors in Yonkers, New York, U.S., March 29, 2021. Image used for illustrative purpose

Nurse Kim Sonderland with the Tanana Chiefs Conference vaccinates a resident in Eagle, Alaska, U.S., March 31, 2021.