Here in Sweden all kindergartens and schools up to the month of June the year people turn 16 remain open. In almost all other European country schools are closed.
I do not really know why our schools are open, the official policy is unclear. One idea though is to get the children to catch the disease while the elders remain in hiding in order to acquire more immunity in the society.
However, according to some Chinese study younger people seem to be able to fight the disease without antibodies. In the age group 15-39 the number of antibodies found were less then a third of the number of antibodies found in the age group 60-85.
Question: To what extent does infected people in the age group 0-16 develop antibodies against covid-19?
I know that presence of antibodies do not necessarily guarantee immunity against reinfection but if children do not produce enough antibodies they will obviously not be immune.