Students wearing COVID-19 protective gear social distance during snack time on an outdoor court on their first day back to in-person class since Spring last year at Liceo Lunita, a private school in Chia on the outskirts of Bogota, Colombia, Friday, Feb. 5, 2021. (AP Photo/Ivan Valencia)

A student wearing COVID-19 protective gear exits a disinfection area on the first day back to in-person class since Spring last year at Liceo Lunita, a private school in Chia on the outskirts of Bogota, Colombia, Friday, Feb. 5, 2021. (AP Photo/Ivan Valencia)

A math teacher stands before students, all wearing COVID-19 protective gear on the first day back to in-person class since Spring last year at Liceo Lunita, a private school in Chia on the outskirts of Bogota, Colombia, Friday, Feb. 5, 2021. (AP Photo/Ivan Valencia)

Students wearing COVID-19 protective gear socially distance in line to enter classrooms on the first day back to in-person class since Spring last year at Liceo Lunita, a private school in Chia on the outskirts of Bogota, Colombia, Friday, Feb. 5, 2021. (AP Photo/Ivan Valencia)

Parents and children wearing COVID-19 protection gear socially distance to enter Liceo Lunita, a private school, on the first day back to in-person class since Spring last year, in Chia on the outskirts of Bogota, Colombia, Friday, Feb. 5, 2021. (AP Photo/Ivan Valencia)

Students wear COVID-19 protective gear on the first day back to in-person class since Spring last year at Liceo Lunita, a private school in Chia on the outskirts of Bogota, Colombia, Friday, Feb. 5, 2021. (AP Photo/Ivan Valencia)

Students wear COVID-19 protective gear on the first day back to in-person class since Spring last year at Liceo Lunita, a private school in Chia on the outskirts of Bogota, Colombia, Friday, Feb. 5, 2021. (AP Photo/Ivan Valencia)

A teacher takes a student's temperature at the start of the first day back to in-person class since Spring last year at Liceo Lunita, a private school in Chia on the outskirts of Bogota, Colombia, Friday, Feb. 5, 2021. (AP Photo/Ivan Valencia)

Students wear COVID-19 protective gear on the first day back to in-person class since Spring last year at Liceo Lunita, a private school in Chia on the outskirts of Bogota, Colombia, Friday, Feb. 5, 2021. (AP Photo/Ivan Valencia)

A signs announces that mask wearing is obligatory amid the COVID-19 pandemic on the first day back to in-person class since Spring last year at Liceo Lunita, a private school in Chia on the outskirts of Bogota, Colombia, Friday, Feb. 5, 2021. (AP Photo/Ivan Valencia)

Parents and children wearing COVID-19 protection gear socially distance to enter Liceo Lunita, a private school, on the first day back to in-person class since Spring last year, in Chia on the outskirts of Bogota, Colombia, Friday, Feb. 5, 2021. (AP Photo/Ivan Valencia)

A teacher shows the way to a student at the start of the first day back to in-person class since March 2020 when the COVID-19 pandemic shut down in-person education at Liceo Lunita, a private school in Chia on the outskirts of Bogota, Colombia, Friday, Feb. 5, 2021. (AP Photo/Ivan Valencia)

Students wear COVID-19 protective gear on the first day back to in-person class since March 2020 at Liceo Lunita, a private school in Chia on the outskirts of Bogota, Colombia, Friday, Feb. 5, 2021. (AP Photo/Ivan Valencia)

Students wearing COVID-19 protective gear social distance during snack time on their first day back to in-person class since March 2020 at Liceo Lunita, a private school in Chia on the outskirts of Bogota, Colombia, Friday, Feb. 5, 2021. (AP Photo/Ivan Valencia)