Ok,so kids which are more likely to be picked up and held transmit slightly more than other kids.

This sheds no light on my original query which seeks to compare viral loads and transmission rates between unvaccinated kids and vaccinated adults. First, vaccines were not available during the study. Second, it only considered one direction, kids to adults. One would need to do a multi way with more age groups. We know the disease is skewed w.r.t. age.