Why do kindergarten teachers need to run health certificate primary schools?

Kindergarten teachers need to run health certificate primary schools for no reason. According to relevant public information, kindergarten teachers should contact with children every day, eat, play and study together. Children are young, have poor resistance, and their health is certain. Primary school teachers don't have to accompany their children to eat and play, and the children are very resistant. Kindergarten teachers should bring their valid ID card, a copy of ID card and two photos when handling the health certificate.