As long as we're talking about children for a moment, let's also mention the practice of bringing a sick child to work. It's one thing to bring a child to work because he or she is out for a short time. But a day-long issue may be a real problem for the staff. The child may infect everyone at work. Sorry to be so basic here, but people do need to hear this.
Some fundamental hygiene comes to mind.
You keep tissues around, just as you might keep breath mints around. Wash your hands. Or the spa. You know who you are. Then there are the sounds.