A growing number of public schools are using mascots, food trucks and prize giveaways to create a pep-rally atmosphere aimed at encouraging students to get vaccinated against the coronavirus before summer vacation.

Districts from California to Michigan are offering free prom tickets and deploying mobile vaccination teams to schools to inoculate students 12 and up so everyone can return to classrooms in the fall. They are also enlisting students who have gotten shots to press their friends to do the same.

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Los Angeles Unified School District officials and students hold a news conference to announce a school-based COVID-19 vaccination event for students 12 and older in San Pedro, Calif., Monday, May 24, 2021. Schools are turning to mascots, prizes and contests to entice youth ages 12 and up to get vaccinated against the coronavirus before summer break. (AP PhotoDamian Dovarganes)

A growing number of public schools are using mascots, food trucks and prize giveaways to create a pep-rally atmosphere aimed at encouraging students to get vaccinated against the coronavirus before summer vacation.

Los Angeles Unified Superintendent Austin Beutner takes questions from the media before students are vaccinated at a school-based COVID-19 vaccination clinic for students 12 and older in San Pedro, Calif., Monday, May 24, 2021. He said the district is offering paid leave for district employees to get their children inoculated. Schools where more than 30% of students are vaccinated will each receive $5,000 for projects, and students can decide how the money is used. (AP PhotoDamian Dovarganes)

The massive effort has just gotten underway because it was only two weeks ago that federal regulators authorized the Pfizer vaccine for children 12 to 15. Younger children are not yet eligible.

People protest outside of Southfield High School in Southfield, Mich., during the hours of a COVID-19 vaccination clinic on Friday, May 21, 2021. Students who show proof of vaccination will get a free ticket to the senior prom worth $80. The incentive drew protesters who said awarding the vaccinated could lead to harassment of students who haven't gotten shots. (Kimberly P. MitchellDetroit Free Press via AP)

Depending on the state and even county, minors may be required to have a parent present to get the shot. Some parents may not be able to get away from work to do that. Others are unsure about allowing their kids to get a vaccine that only was approved for emergency use.

People protest outside of Southfield High School in Southfield, Mich., during the hours of a COVID-19 vaccination clinic on Friday, May 21, 2021. Students who show proof of vaccination will get a free ticket to the senior prom worth $80. The incentive drew protesters who said awarding the vaccinated could lead to harassment of students who haven't gotten shots. (Kimberly P. MitchellDetroit Free Press via AP)

“I'm not getting it," said Tatum Merrill, 14, standing with friends outside a mobile vaccine clinic at the school. “It was developed too fast and is kind of sketchy. And I feel like the number of COVID cases is dying down so if everybody else has it, there may not be a need for me to have it."

Indira Cisneron holds her son German Vazquez, right, while waiting to get her first vaccination shot with her other son Gabriel Vasquez, center, 13, in southwest Detroit on Thursday, May 13, 2021. School districts from California to Michigan are offering free prom tickets and deploying mobile vaccination teams to schools to inoculate students 12 and up so everyone can return to classrooms in the fall. They are also enlisting students who have gotten shots to press their friends to do the same. (Ryan GarzaDetroit Free Press via AP)

While hundreds of colleges across the country are requiring students to have proof of vaccination to return to campus, K-12 public schools are instead trying to entice students by making the experience festive while sending flyers home to families to address the vaccine's safety.

Veronica Diaz, 48, of Detroit stands by as her son Javier Belmares, 14, becomes nervous as he prepares to get his first Pfizer COVID vaccine shot by Medical Assistant Stephanie Yang during a vaccine clinic at Ideal Group in southwest Detroit on Thursday, May 13, 2021. School districts from California to Michigan are offering free prom tickets and deploying mobile vaccination teams to schools to inoculate students 12 and up so everyone can return to classrooms in the fall. They are also enlisting students who have gotten shots to press their friends to do the same. (Ryan GarzaDetroit Free Press via AP)

The idea won applause from Dr. Howard Taras, a University of California San Diego pediatrician who consults with districts about health safety. He is also the in-house physician for the San Diego Unified School District, the second-largest in California with about 120,000 students. It has been hosting vaccine clinics at schools in communities with low vaccination rates.

FILE - In this May 19, 2021, file photo, nervous to get her vaccination shot, Maya Davis, 12, of Washington, holds hands with her mother, Maisha Cosby, as she receives the Pfizer COVID-19 vaccine, at a drive-thru clinic held by Community of Hope, a community health organization, at the Washington School for Girls in southeast Washington. Several schools sent information about the vaccine drive to their students' families to ensure access to the vaccine, newly approved for children ages 12-15. Cosby also received a vaccine at the event, "I'd been waiting it out a bit to make sure people weren't dropping dead," joked Cosby, "all my friends have gotten it and they're fine and I'm ready for her to go back to school." (AP PhotoJacquelyn Martin, File)

The virus has spread more rapidly among teens than younger children. “But with a large portion immunized, there is much less chance of it spreading in the classrooms, on buses," Taras said.

Officials are concerned that once school lets out, it will be even tougher to get enough teens vaccinated in time to guarantee widespread immunity on campuses.

Los Angeles Unified School District officials and students hold a news conference to announce a school-based COVID-19 vaccination event for students 12 and older in San Pedro, Calif., Monday, May 24, 2021. Schools are turning to mascots, prizes and contests to entice youth ages 12 and up to get vaccinated against the coronavirus before summer break. (AP PhotoDamian Dovarganes)

Los Angeles Unified School District officials and students hold a news conference to announce a school-based COVID-19 vaccination event for students 12 and older in San Pedro, Calif., Monday, May 24, 2021. Schools are turning to mascots, prizes and contests to entice youth ages 12 and up to get vaccinated against the coronavirus before summer break. (AP PhotoDamian Dovarganes)

The massive effort has just gotten underway because it was only two weeks ago that federal regulators authorized the Pfizer vaccine for children 12 to 15. Younger children are not yet eligible.

So far, about 14% of the nation's 15 million kids ages 12 to 15 have received their first shot, according to the Centers for Disease Control and Prevention. Among 7.5 million teens ages 16 and 17, that number goes up to 34%, and about 22% have had both shots, according to the latest figures released Monday. The doses are scheduled about three weeks apart.

There are many challenges.

Los Angeles Unified Superintendent Austin Beutner takes questions from the media before students are vaccinated at a school-based COVID-19 vaccination clinic for students 12 and older in San Pedro, Calif., Monday, May 24, 2021. He said the district is offering paid leave for district employees to get their children inoculated. Schools where more than 30% of students are vaccinated will each receive $5,000 for projects, and students can decide how the money is used. (AP PhotoDamian Dovarganes)

Los Angeles Unified Superintendent Austin Beutner takes questions from the media before students are vaccinated at a school-based COVID-19 vaccination clinic for students 12 and older in San Pedro, Calif., Monday, May 24, 2021. He said the district is offering paid leave for district employees to get their children inoculated. Schools where more than 30% of students are vaccinated will each receive $5,000 for projects, and students can decide how the money is used. (AP PhotoDamian Dovarganes)

Depending on the state and even county, minors may be required to have a parent present to get the shot. Some parents may not be able to get away from work to do that. Others are unsure about allowing their kids to get a vaccine that only was approved for emergency use.

Protests have popped up outside schools offering the vaccine, discouraging kids who may already be nervous.

Mission Bay High School in San Diego provides an example of the mixed reaction among students.

People protest outside of Southfield High School in Southfield, Mich., during the hours of a COVID-19 vaccination clinic on Friday, May 21, 2021. Students who show proof of vaccination will get a free ticket to the senior prom worth $80. The incentive drew protesters who said awarding the vaccinated could lead to harassment of students who haven't gotten shots. (Kimberly P. MitchellDetroit Free Press via AP)

People protest outside of Southfield High School in Southfield, Mich., during the hours of a COVID-19 vaccination clinic on Friday, May 21, 2021. Students who show proof of vaccination will get a free ticket to the senior prom worth $80. The incentive drew protesters who said awarding the vaccinated could lead to harassment of students who haven't gotten shots. (Kimberly P. MitchellDetroit Free Press via AP)

“I'm not getting it," said Tatum Merrill, 14, standing with friends outside a mobile vaccine clinic at the school. “It was developed too fast and is kind of sketchy. And I feel like the number of COVID cases is dying down so if everybody else has it, there may not be a need for me to have it."

Her friend Brandon Cheeks, 15, said he wants the vaccine, but his mother is unsure. In the meantime, another 15-year-old, Laura Pilger, said she feels safer being back in school knowing that she and everyone she knows is vaccinated.

“A woman showed up and was passing out flyers that said ‘your body, your choice' but the message was not very welcomed," Pilger said. “Why wouldn't you want to get the vaccine?"

People protest outside of Southfield High School in Southfield, Mich., during the hours of a COVID-19 vaccination clinic on Friday, May 21, 2021. Students who show proof of vaccination will get a free ticket to the senior prom worth $80. The incentive drew protesters who said awarding the vaccinated could lead to harassment of students who haven't gotten shots. (Kimberly P. MitchellDetroit Free Press via AP)

People protest outside of Southfield High School in Southfield, Mich., during the hours of a COVID-19 vaccination clinic on Friday, May 21, 2021. Students who show proof of vaccination will get a free ticket to the senior prom worth $80. The incentive drew protesters who said awarding the vaccinated could lead to harassment of students who haven't gotten shots. (Kimberly P. MitchellDetroit Free Press via AP)

While hundreds of colleges across the country are requiring students to have proof of vaccination to return to campus, K-12 public schools are instead trying to entice students by making the experience festive while sending flyers home to families to address the vaccine's safety.

In suburban Detroit, students in the Southfield district who show proof of vaccination will get a free ticket to the senior prom worth $80. The incentive drew protesters who said awarding the vaccinated could lead to harassment of students who haven't gotten shots.

“We are not separating or segregating students who choose not to receive the vaccine or do receive the vaccine,” Southfield Superintendent Jennifer Green said. “We simply want to provide our students an opportunity to celebrate this milestone in their life.”

Indira Cisneron holds her son German Vazquez, right, while waiting to get her first vaccination shot with her other son Gabriel Vasquez, center, 13, in southwest Detroit on Thursday, May 13, 2021. School districts from California to Michigan are offering free prom tickets and deploying mobile vaccination teams to schools to inoculate students 12 and up so everyone can return to classrooms in the fall. They are also enlisting students who have gotten shots to press their friends to do the same. (Ryan GarzaDetroit Free Press via AP)

Indira Cisneron holds her son German Vazquez, right, while waiting to get her first vaccination shot with her other son Gabriel Vasquez, center, 13, in southwest Detroit on Thursday, May 13, 2021. School districts from California to Michigan are offering free prom tickets and deploying mobile vaccination teams to schools to inoculate students 12 and up so everyone can return to classrooms in the fall. They are also enlisting students who have gotten shots to press their friends to do the same. (Ryan GarzaDetroit Free Press via AP)

The idea won applause from Dr. Howard Taras, a University of California San Diego pediatrician who consults with districts about health safety. He is also the in-house physician for the San Diego Unified School District, the second-largest in California with about 120,000 students. It has been hosting vaccine clinics at schools in communities with low vaccination rates.

The district also took part in a public service announcement with local teens who say, “We'll be getting the vaccine, now it's your turn.”

“I think anything that is creating buzz helps," Taras said, explaining that vaccinating at schools has the added benefit of generating peer pressure.

Veronica Diaz, 48, of Detroit stands by as her son Javier Belmares, 14, becomes nervous as he prepares to get his first Pfizer COVID vaccine shot by Medical Assistant Stephanie Yang during a vaccine clinic at Ideal Group in southwest Detroit on Thursday, May 13, 2021. School districts from California to Michigan are offering free prom tickets and deploying mobile vaccination teams to schools to inoculate students 12 and up so everyone can return to classrooms in the fall. They are also enlisting students who have gotten shots to press their friends to do the same. (Ryan GarzaDetroit Free Press via AP)

Veronica Diaz, 48, of Detroit stands by as her son Javier Belmares, 14, becomes nervous as he prepares to get his first Pfizer COVID vaccine shot by Medical Assistant Stephanie Yang during a vaccine clinic at Ideal Group in southwest Detroit on Thursday, May 13, 2021. School districts from California to Michigan are offering free prom tickets and deploying mobile vaccination teams to schools to inoculate students 12 and up so everyone can return to classrooms in the fall. They are also enlisting students who have gotten shots to press their friends to do the same. (Ryan GarzaDetroit Free Press via AP)

The virus has spread more rapidly among teens than younger children. “But with a large portion immunized, there is much less chance of it spreading in the classrooms, on buses," Taras said.

And more students may want to return to classrooms as a result.

While most California public schools reopened in April, fewer than half of students resumed in-person learning, according to an analysis by the nonprofit EdSource.

FILE - In this May 19, 2021, file photo, nervous to get her vaccination shot, Maya Davis, 12, of Washington, holds hands with her mother, Maisha Cosby, as she receives the Pfizer COVID-19 vaccine, at a drive-thru clinic held by Community of Hope, a community health organization, at the Washington School for Girls in southeast Washington. Several schools sent information about the vaccine drive to their students' families to ensure access to the vaccine, newly approved for children ages 12-15. Cosby also received a vaccine at the event, "I'd been waiting it out a bit to make sure people weren't dropping dead," joked Cosby, "all my friends have gotten it and they're fine and I'm ready for her to go back to school." (AP PhotoJacquelyn Martin, File)

FILE - In this May 19, 2021, file photo, nervous to get her vaccination shot, Maya Davis, 12, of Washington, holds hands with her mother, Maisha Cosby, as she receives the Pfizer COVID-19 vaccine, at a drive-thru clinic held by Community of Hope, a community health organization, at the Washington School for Girls in southeast Washington. Several schools sent information about the vaccine drive to their students' families to ensure access to the vaccine, newly approved for children ages 12-15. Cosby also received a vaccine at the event, "I'd been waiting it out a bit to make sure people weren't dropping dead," joked Cosby, "all my friends have gotten it and they're fine and I'm ready for her to go back to school." (AP PhotoJacquelyn Martin, File)

Many continued with online learning, while some dropped out altogether or went to private schools. Public school enrollment dropped steeply in the nation’s most populous state, falling by more than 160,000 this school year, according to the California Department of Education.

The Los Angeles Unified School District, the largest in California with about 600,000 students, plans to have a mobile vaccination team visit every middle and high school campus at least once before the school year ends June 11. The events will feature food trucks and music.

Superintendent Austin Beutner recently appeared with Wilson High School's “Mighty Mule" mascot to encourage students to roll up their sleeves. He said the district is offering paid leave for district employees to get their children inoculated. Schools where more than 30% of students are vaccinated will each receive $5,000 for projects, and students can decide how the money is used.

The school-based clinics also help administer shots to hard-to-reach populations who feel more comfortable going to their neighborhood school instead of mass vaccination sites.

Maisha Cosby was motivated by a drive-thru clinic at the Washington School for Girls in Washington, D.C. She held her 12-year-old daughter Maya's hand as she got her shot. Then Cosby got hers.

“All my friends have gotten it and they’re fine, and I’m ready for her to go back to school,” Cosby said.

Associated Press writers Ed White in Detroit and Jacquelyn Martin in Washington contributed to this report.