Kevin, 6, takes a zoom class as the Westchester Family YMCA provides a safe distance learning environment for local students during the outbreak of the coronavirus disease (COVID-19) in Los Angeles, California, U.S., March 2, 2021.

A water fountain is taped off to prevent students from drinking amid the coronavirus disease (COVID-19) pandemic, at the Mount Vernon Community School in Alexandria, Virginia, U.S., March 2, 2021.

A student writes after returning to school as coronavirus disease (COVID-19) restrictions are lifted in Philadelphia, Pennsylvania, U.S., March 8, 2021.

Mwajuma Tabyawa applies cream on her son Mmema Mkangya after his shower, on his first day back to school after coronavirus disease (COVID-19) restrictions were adjusted, in Louisville, Kentucky, U.S. March 17, 2021.

Esther Bahome and Mmema Mkangya wait on the porch with their parents for the bus to pick them up on the first day back to school after coronavirus disease (COVID-19) restrictions were adjusted, in Louisville, Kentucky, U.S. March 17, 2021.

Students eat individually as they have to be 6 feet part from each other due to social distancing, on the first day back to school after coronavirus disease (COVID-19) restrictions were adjusted, in Louisville, Kentucky, U.S. March 17, 2021.

Protective plexiglass stands on a teacher's desk ahead of in-person learning, amid the coronavirus disease (COVID-19) pandemic, at the Jefferson-Houston School in Alexandria, Virginia, U.S., February 23, 2021.

Safety guidelines are seen in the hallways as students return to school as coronavirus disease (COVID-19) restrictions are lifted in Philadelphia, Pennsylvania, U.S., March 8, 2021.

Students play outside at recess as coronavirus disease (COVID-19) restrictions are lifted in Philadelphia, Pennsylvania, U.S., March 8, 2021.

Students walk to the lunchroom at Ackerman Elementary school during in-person learning in the small town of Ackerman, Mississippi, U.S. March 11, 2021. In rural Choctaw County, Mississippi, a recent lull in Covid cases and ongoing vaccination campaigns are giving many members of the community a sense of optimism about the yearlong coronavirusA disease (COVID-19) pandemic as MississippiA and surrounding states have announced that they are rescindingA A mask mandates and other coronavirus restrictions.

Students eat individually as they have to be 6 feet part from each other due to social distancing, on the first day back to school after coronavirus disease (COVID-19) restrictions were adjusted, in Louisville, Kentucky, U.S. March 17, 2021.

Auditorium seats are taped off to observe social distancing amid the coronavirus disease (COVID-19) pandemic, at the Mount Vernon Community School in Alexandria, Virginia, U.S., March 2, 2021.

Zion Guice, 12, takes a test via a virtual classroom on his laptop during the coronavirus disease (COVID-19) outbreak in Jackson, Mississippi, U.S. March 9, 2021. Guice fears a possible reinfection if he goes back to school after he withstood a November illness with COVID-19 — even though schools are back to in-person learning in the state capital of one of the first U.S. states to declare themselves fully open after a year of lockdowns and closures. REUTERS/Jonathan Ernst

Students play "Red Light, Green light" as they keep a distance from each other, on the first day back to school after coronavirus disease (COVID-19) restrictions were adjusted, in Louisville, Kentucky, U.S. March 17, 2021.

Older students carry their lunches to their classrooms to eat, leaving the lunchroom free for younger students to keep a social distance during in-person learning at Ackerman Elementary school in the small town of Ackerman, Mississippi, U.S. March 11, 2021. In rural Choctaw County, Mississippi, a recent lull in Covid cases and vaccination campaigns are giving many members of the community a sense of optimism about the yearlong coronavirusA disease (COVID-19) pandemic as MississippiA and surrounding states have announced that they are rescindingA A mask mandates and other coronavirus restrictions.

Kate Sullivan Morgan, who relocated with her family from San Francisco so her children could attend school in-person, hugs her son James, 9, after school in Austin, Texas, U.S., March 12, 2021.

The bus driver verifies the names of Esther Bahome and Mmema Mkangya on their first day back to school after coronavirus disease (COVID-19) restrictions were adjusted, in Louisville, Kentucky, U.S. March 17, 2021.

Esther tries on new shoes as she picks up which one to wear for school, a day before her return to school after the coronavirus disease (COVID-19) restrictions were adjusted, in Louisville, Kentucky, U.S. March 16, 2021.

Students each lunch at school as coronavirus disease (COVID-19) restrictions are lifted in Philadelphia, Pennsylvania, U.S., March 8, 2021.

A boy uses a swab for COVID-19 test to prevent the spread of the coronavirus disease (COVID-19) in the classroom at South Boston Catholic Academy in Boston, Massachusetts, U.S., January 28, 2021.

Choctaw County High School baseball players keep an eye on fly balls during practice in Ackerman, Mississippi, U.S. March 10, 2021. In rural Choctaw County, Mississippi, a recent lull in Covid cases and ongoing vaccination campaigns are giving many members of the community a sense of optimism about a return to regular life in the midst of the the yearlong coronavirusA disease (COVID-19) pandemic, as MississippiA and surrounding states have announced that they are rescindingA A mask mandates and other coronavirus restrictions.

James, 9, and Will, 11, the children of Kate Sullivan Morgan and William Morgan, who relocated so children could attend school in-person, play in the family's new home in Austin, Texas, U.S., March 12, 2021.

A teacher gives a child hand sanitizer to prevent the spread of the coronavirus disease (COVID-19) in the classroom at South Boston Catholic Academy in Boston, Massachusetts, U.S., January 28, 2021.

Alondra and Hendi, both six-years-old, take their zoom class as the Westchester Family YMCA provides a safe distance learning environment for local students during the outbreak of the coronavirus disease (COVID-19) in Los Angeles, California, U.S., March 2, 2021. Image used for illustrative purpose.

A student looks on after returning to school as coronavirus disease (COVID-19) restrictions are lifted in Philadelphia, Pennsylvania, U.S., March 8, 2021.

Older students carry their lunches to their classrooms to eat, leaving the lunchroom free for younger students to keep a social distance during in-person learning at Ackerman Elementary school in the small town of Ackerman, Mississippi, U.S. March 11, 2021. In rural Choctaw County, Mississippi, a recent lull in Covid cases and ongoing vaccination campaigns are giving many members of the community a sense of optimism about the yearlong coronavirusA disease (COVID-19) pandemic as MississippiA and surrounding states have announced that they are rescindingA A mask mandates and other coronavirus restrictions.

Esther Bahome and Mmema Mkangya return home after their first day back to school, following the adjustment of coronavirus disease (COVID-19) restrictions, in Louisville, Kentucky, U.S. March 17, 2021.

Students stand 2 feet apart as they practice social distancing before walking into the cafeteria on the first day back to school after coronavirus disease (COVID-19) restrictions were adjusted, in Louisville, Kentucky, U.S. March 17, 2021.

Students play in small groups in the school playground on the first day back to school after coronavirus disease (COVID-19) restrictions were adjusted, in Louisville, Kentucky, U.S. March 17, 2021.

Will, 11, and James, 9, who moved with their parents to Texas in order to go to in-person school, board the schoolbus before school school in Austin, Texas, U.S., March 12, 2021.

Children play in a gym class with a divider from other kids to prevent the spread of the coronavirus disease (COVID-19) in the classroom at South Boston Catholic Academy in Boston, Massachusetts, U.S., January 28, 2021.

A student holds a pencil after returning to school as coronavirus disease (COVID-19) restrictions are lifted in Philadelphia, Pennsylvania, U.S., March 8, 2021.