That is great that your school nurse sends that out.  Our school nurse has sent that letter out too and has posted something in the school handbook and the school newsletter.  Unfortunatly, nobody reads it or nobody cares because everyone (except me) sends their kids to school sick on a daily basis.  They just send a note saying the child had a fever in the morning but they gave them some Tylenol and they should be fine until 3:00 or whatever.  Nobody wants to miss a day of work or have to take a sick day.   Hoperfully, the parents at your school will listen better than the parents at my children’s school.