I absolutely agree that this man is *&^%$# selfish.
Firstly, if his child's ulcer was due to HFMD, he will be spreading
to the rest of the children in the center.
If the ulcer is not due to HFMD, it is still better to keep the
chgild at home, because when a child develops ulcer, his immunity
system is low, thus is easier to catch any virus present in the
center.
I would say, the precausion done by the scholl and the teachers are
excellent. Hope all childcares will not be affected by this
"disgracful" act of an individual.