DIL works in a children's nursery and often tells me of tiny little children who are brought in, early in the morning, looking clearly unwell. One such toddler was just 3 years old and he didn't look, or seem, very well at all, but his mother made it clear that she was anxious to get away and leave him as she had to go to work. As anticipated, the little lad was violently sick, and had diarrhoea, within the first hour. A hasty call was made to both of his parents to ask them to come and collect him asap but it was almost home time before his father arrived. He was informed that the boy would have to be clear of sickness and diarrhoea for 72 hours before he could come back but the next morning, the little boy was brought back to nursery as though nothing happened the day before. His mum wasn't at all happy that, for the well being of all the other children, she'd couldn't leave him.