Why is hybrid for middle and high school recommended now and wasn’t before?

In consultation with the school superintendents, the mitigation measures that have been put in place at the elementary school level have been effective at containing the spread of the disease. Similar measures are being put in place for middle and high schools. We do recognize the differences in processes between elementary and secondary schools. The ability to keep schools open will depend on how well students, parents and staff comply with mitigation measures.