FILE - Mayor Bill de Blasio, left, touching elbows with a student, during a visit with Schools Chancellor Meisha Porter, right, at Phyl's Academy in the Brooklyn, N.Y., on Wednesday March 24, 2021. New York City teachers and other school staff members are supposed to be vaccinated against COVID-19 when the bell rings Monday morning, Oct. 4 in one of the first districtwide mandates requiring school employees to be inoculated against the coronavirus. (AP Photo/Mark Lennihan, File)