That may be true, bumble, but to deliberately expose young babies and children is, IMO, shockingly ignorance and irresponsible. I would have complained A LOT about such an individual in such a position.
DD1 got it at nursery, it was before there was a vaccine. She got swine flu, too, from that nursery, again, before there was a vaccine and before the people knew they were sick. In fact, what happened in the later case was that a father of one of the children was on a hired coach to an away football game that picked up a number of fans in a neighbouring town who were all carrying. They caused a serious outbreak in our small town and in the city where they went and sat in a crowded stadium.
Nothing intentional, this happens.
But to deliberately expose people is ignorant and irresponsible, IMO, no matter how 'endemic'.
My child died of an endemic virus she obviously contracted in hospital, seeing as she was in strict isolation at the time, HMV. I accept that many people carry this and are asymptomatic entirely and that it can make even healthy children very ill.
But no one deliberately exposed her, an immune-compromised child.