because its the same kid in my dd's class who is infecting everyone. Every month a letter comes home asking us to check heads for infestation. It is always the same little boy who scratches his head like crazy and his mum stands there oblivious. His two sisters also stand there at home time scratching so it's obvious he's catching it from then. I know it's a viscious circle but I don't see the point in checking if the source of the infestation is spreading it to all and sundry. The teacher very diplomatically mentioned that the mother of the boy isn't very vigilant in checking. So short of shaving of all of dd's hair, what should I do?