Remember that there are multiple days of being contagious before symptoms appear.
White House formally declaring teachers essential workers
By Sarah Westwood for CNN
21 August 2020
"The guidance for essential workers states that they can continue to work even after exposure to a confirmed case of Covid-19, provided they remain asymptomatic. Schools' contribution to community spread has already been a top concern for districts making the decision to open or close, so pushing teachers to continue working after potential exposure could prove controversial."
White House formally declaring teachers essential workers
By Sarah Westwood for CNN
21 August 2020
"The guidance for essential workers states that they can continue to work even after exposure to a confirmed case of Covid-19, provided they remain asymptomatic. Schools' contribution to community spread has already been a top concern for districts making the decision to open or close, so pushing teachers to continue working after potential exposure could prove controversial."