A mum at school has two kids. One in my middle sons class and one in my oldest sons class. She is a dinner lady at school.
She cheerfully informed me and DH last week that she's suffering from severe sickness and diarrhea 
She's on sick from work as she can't work but yet still drops off and collects her kids from school. She has a partner who follows her everywhere. He could have dropped off and collected the kids everyday whilst she's poorly.
A school newsletter was sent out last Friday stating that children with d&s should remain off school 48 hours after the last bout of illness.
I replied to the head teachers newsletters (I receive it by email) saying he should put it in the school newsletter that the same rule applies for parents!!
Wibu and Aibu to be annoyed at her. You wouldn't send your children to school with it so why go and possibly still infect we children's classes.