Aidan Mohl, 13, waits in line to receive the Pfizer's vaccine against coronavirus disease (COVID-19) after Georgia authorized the vaccine for ages over 12 years, at Dekalb Pediatric Center in Decatur, Georgia, U.S. May 11, 2021.

A girl receives a coronavirus disease (COVID-19) vaccine in Worcester, Pennsylvania, U.S., April 29, 2021.

Lilly Dembo, 15, shows off her vaccinated arm in front of balloons spelling #Vaxed after receiving a coronavirus disease (COVID-19) vaccination at a vaccine clinic for newly eligible 12 to 15-year-olds at the Annenberg Foundation in Los Angeles, California, U.S., May 13, 2021.

Grace Mondillo, 13, receives the Pfizer-BioNTech coronavirus disease (COVID-19) vaccine after Pennsylvania authorized the vaccine for those over 12-years-old at Skippack Pharmacy in Schwenksville, Pennsylvania, U.S., May 12, 2021.

Rafael Maeder Moreira, 12, rubs his arm after receiving a coronavirus disease (COVID-19) vaccination at a vaccine clinic for newly eligible 12 to 15-year-olds at the Annenberg Foundation in Los Angeles, California, U.S., May 13, 2021.

Thomas Macconnell, 16, who is on the autism spectrum, receives a coronavirus disease (COVID-19) vaccine in Worcester, Pennsylvania, U.S., April 29, 2021.

Kira Lundell, 16, who is on the autism spectrum, receives a coronavirus disease (COVID-19) vaccine at Variety - the Children’s Charity of the Delaware Valley during a vaccine clinic on their campus in conjunction with Skippack Pharmacy in Worcester, Pennsylvania, U.S., April 29, 2021.

A teenager is inoculated with Pfizer's vaccine against coronavirus disease (COVID-19) after Georgia authorized the vaccine for ages over 12 years, at Dekalb Pediatric Center in Decatur, Georgia, U.S. May 11, 2021.

Family members look on as Jack Frilingos, 12, is inoculated with Pfizer's vaccine against coronavirus disease (COVID-19) after Georgia authorized the vaccine for ages over 12 years, at Dekalb Pediatric Center in Decatur, Georgia, U.S. May 11, 2021.

Aidan Mohl, 13, (L) joins others in a waiting room after receiving Pfizer's vaccine against coronavirus disease (COVID-19), after Georgia authorized the vaccine for ages over 12 years, at Dekalb Pediatric Center in Decatur, Georgia, U.S. May 11, 2021.

Meadow Conser, 14, receives the Pfizer-BioNTech coronavirus disease (COVID-19) vaccine after Pennsylvania authorized the vaccine for those over 12-years-old at Skippack Pharmacy in Schwenksville, Pennsylvania, U.S., May 12, 2021.

Star Wars and Frozen band-aids are seen at a coronavirus disease (COVID-19) vaccine clinic for newly eligible 12 to 15-year-olds at the Annenberg Foundation in Los Angeles, California, U.S., May 13, 2021.

Siya Amin, 13, receives the Pfizer-BioNTech coronavirus disease (COVID-19) vaccine after Pennsylvania authorized the vaccine for those over 12-years-old at Skippack Pharmacy in Schwenksville, Pennsylvania, U.S., May 12, 2021.

Maddy Yoo, 12, is inoculated with Pfizer's vaccine against coronavirus disease (COVID-19), after Georgia authorized the vaccine for ages over 12 years, at Dekalb Pediatric Center in Decatur, Georgia, U.S. May 11, 2021.

Cooper Semrad, 15, is inoculated with Pfizer's vaccine against coronavirus disease (COVID-19) by Registered Medical Assistant Melissa Dalton, after Georgia authorized the vaccine for ages over 12 years, at Dekalb Pediatric Center in Decatur, Georgia, U.S. May 11, 2021.

A supply of Pfizer's vaccine against coronavirus disease (COVID-19) is seen at Dekalb Pediatric Center, after it is authorized in Georgia for ages over 12 years, in Decatur, Georgia, U.S. May 11, 2021.

Maddy Yoo, 12, waves to a friend as she waits in line to receive Pfizer's vaccine against coronavirus disease (COVID-19) after Georgia authorized the vaccine for ages over 12 years, at Dekalb Pediatric Center in Decatur, Georgia, U.S. May 11, 2021.

Naomi Ignacio, 13, talks on the phone after receiving a coronavirus disease (COVID-19) vaccination at a vaccine clinic for newly eligible 12 to 15-year-olds at the Annenberg Foundation in Los Angeles, California, U.S., May 13, 2021.

Abby Oplinger, 13, receives the Pfizer-BioNTech coronavirus disease (COVID-19) vaccine after Pennsylvania authorized the vaccine for those over 12-years-old at Skippack Pharmacy in Schwenksville, Pennsylvania, U.S., May 12, 2021.

Cayla Crume, 14, is inoculated with Pfizer's vaccine against coronavirus disease (COVID-19), after Georgia authorized the vaccine for ages over 12 years, at Dekalb Pediatric Center in Decatur, Georgia, U.S. May 11, 2021.

Grace Peterson, 14, is inoculated with Pfizer's vaccine against coronavirus disease (COVID-19) after Georgia authorized the vaccine for ages over 12 years, at Dekalb Pediatric Center in Decatur, Georgia, U.S. May 11, 2021.

Kate Kleeman, 12, holds the hand of her mom, Hayley, as she receives a coronavirus disease (COVID-19) vaccination at a vaccine clinic for newly eligible 12 to 15-year-olds at the Annenberg Foundation in Los Angeles, California, U.S., May 13, 2021.

Aidan Mohl, 13, waits to be inoculated with Pfizer's vaccine against coronavirus disease (COVID-19) after Georgia authorized the vaccine for ages over 12 years, at Dekalb Pediatric Center in Decatur, Georgia, U.S. May 11, 2021.

Nancy Solomon hugs one of her two daughters after they both received a coronavirus disease (COVID-19) vaccination at a vaccine clinic for newly eligible 12 to 15-year-olds at the Annenberg Foundation in Los Angeles, California, U.S., May 13, 2021.

Aidan Mohl, 13, is inoculated with Pfizer's vaccine against coronavirus disease (COVID-19) by Registered Medical Assistant Melissa Dalton, after Georgia authorized the vaccine for ages over 12 years, at Dekalb Pediatric Center in Decatur, Georgia, U.S. May 11, 2021.