Oh I live in fear of this! My DD had a case of it when she was in her first year of school and must have caught it from another student. I'll never forget the horror of seeing one in the toilet... lucky I saw it though... otherwise I may never have known! I can't remember what i had to do... I just spoke to a chemist.... that was about 10 years ago. Probably time I had a refresher course... my DS is now the same age, and in his first year at school. Geeze, what with head lice and all the other stuff they can catch at school it's a real minefield!