for Syag,
I just looked up a recent case study from a Belgium 1-12 school where traced cases at school as much as they could. Teachers were masked, students were not. Ths is pre-delta. They were able to trace about half of cases to either in-school or at-home transmission. The rest are unknown. So, school and home have a significant part. Among known transmissions, 2/3 were at school, 1/3 at home. School ones were about equally distributed between adult-adult, adult-child, child-child.
