Aziyah Samuels, 11, is the only student in her 6th grade class at John Hayden Middle School in Southeast Washington, DC, Feb. 5, 2021. After many contentious months, DC reopened school buildings with teachers and students this week.

Stephanie Chavez teaches outside the Seward Communication Arts Academy. Fellow Chicago Teachers Union members staged a teach-out, Jan. 21, 2021, to protest the city's reopening plan for public schools.

Preschool teacher Erin Berry greets students as they walk into Dawes Elementary School in Chicago, Jan. 11, 2021. <br><br> It was the first day of optional in-person learning for preschoolers and some special education students in Chicago Public Schools after going remote last March due to the coronavirus pandemic.

Pre-kindergarten students listen as their teacher reads a story at Dawes Elementary in Chicago, Jan. 11, 2021.

Children take part in a protest demanding that public schools remain open, outside City Hall, Nov. 19, 2020, in New York. <br><br> New York City public schools will close temporarily starting Nov. 19, 2020 which was prompted by the city reaching a 3% test positivity rate over a seven-day rolling average

Teacher Elizabeth DeSantis, wears a mask and face shield, as a first grader reads during class at Stark Elementary School, Sept. 16, 2020, in Stamford, Conn.

Teachers work outside their school building for safety reasons as they prepare for the delayed start of the school year in Brooklyn, New York. The New York City school district is the only major one in the country that will reopen for in-person learning.

Cruz Maldonado, a third grader at Cloverly Elementary School, attends his virtual school lesson at home in Burtonsville, Md., Sept. 1, 2020.

An instructor walks through the room as students from different schools and in different grades follow their online classes from desks separated by plastic barriers at the Westwood STAR Tutoring & Enrichment Center, Sept. 10, 2020, in Los Angeles.

Students take livestream classes while seated in socially distanced protective learning pods at STAR Eco Station Tutoring & Enrichment Center on Sept. 2, 2020 in Culver City, Calif.

Brothers Forest and Kainoa Hays talk with each other while riding the bus to Trinity High and Weaverville Elementary on Aug. 17, 2020 in Junction City, Calif.

Teacher Rachel La Fein talks with her class as the students sit spaced apart, outside at Trinity High School, Aug. 18, 2020 in Weaverville, Calif.

Harminder Sehmi of Enviro-Master, disinfects toys with an electrostatic 'virus vaporizer' at a childcare center in Elk Grove, Calif. July 23, 2020, amid the coronavirus pandemic.

Doral Academy Red Rock Elementary School kindergartner Scarlett Keeler, 5, raises her hand as she takes an online reading and science class on her first day of distance learning amid the spread of the coronavirus (COVID-19) on Aug. 24, 2020 in Las Vegas. Clark County School District, the fifth-largest school district in the United States with more than 315,000 students, decided to start the school year with a full-time distance education instructional model as part of its Reopening Our Schools Plan due to health and safety concerns over the pandemic.

Administrative assistant Marie Delvalle sits behind a glass panel installed in the main office to prevent the spread of the coronavirus at Mantua Elementary School in Fairfax, Va., July 17, 2020.

Paul Adams, 7, waits at the bus stop for the first day of school, Aug. 3, 2020, in Dallas, Ga.

Aimee Rodriguez Webb works on her computer reading emails at her dining room table she set up as a virtual classroom for a Cobb County school on July 28, 2020, in Marietta, Ga. After a rocky transition to distance learning last spring, Webb is determined to do better this fall. She bought a dry-erase board and a special camera to display worksheets, and she set up her dining room to broadcast school lessons.

In this photo posted on Twitter, students crowd a hallway, Aug. 4, 2020, at North Paulding High School in Dallas, Ga.

A student has his temperature checked by a teacher before entering a school for summer classes in Texas, July 14, 2020.

A student climbs the stairs of a school bus before the first day of school in Dallas, Aug. 3, 2020.

Wearing masks to prevent the spread of COVID-19, elementary school students begin their school day in Godley, Texas, Aug. 5, 2020.

Wearing masks to prevent the spread of COVID-19, a teacher helps elementary school students before classes begin for the day in Godley, Texas, Aug. 5, 2020.

Elementary school students wearing masks to prevent the spread of COVID-19, wait for classes to begin in Godley, Texas, Aug. 5, 2020.

Elementary school students use hand sanitizer before entering school for classes in Godley, Texas, Aug. 5, 2020. Three rural school districts in Johnson County were among the first in Texas to head back to school for in-person classes for students.

Corinth High School students follow the directional signage posted on the floor and keep foot traffic moving in the proper direction as they change classes on the first day back to school in Corinth, Miss., July 27, 2020. A student tested positive the first week of classes. The school conducted contact tracing and requires those notified to quarantine for 14 days while attending class virtually.

Corinth Elementary School students social distance as they line up after leaving the restroom on their first day back to school in Corinth, Miss., July 27, 2020. The district was the first in the state to reopen.

Corinth Elementary School students have their temperature checked by a thermal scanner as they arrive for their first day back to school, July 27, 2020 in Corinth, Miss.