To think there's no point in asking parents to check for nits

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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?

You should be frequently checking the hair anyway,

Unfortunately it's an ongoing problem with this boy along with other issues. I understand the authorities are involved in some capacity. Also, a teacher very discreetly advised against visits to his house. So its part of a wider and on going situation involving his family. It's very sad for the child as he's being isolated from activities because of his parents inability to clear his head.

I can and do check my kids hair but I feel my efforts are undermined by his mother.

There shouldn't be any pussy footing around.

The head teacher should tell the parents straight, your child has a recurring (never ending) problem with lice and it needs sorting, otherwise we may have to refer to social care.

Some people are thick, some people are on another planet and some just can't be arsed to look after their kids properly, but why should they get away with it especially when the result is passing note around the class over and over again.

Yes. Kids get them abd some are more prone than others but home should be checking etc. That said, if a child has blonde hair then home might miss them and theyrr more troublesome to tackle so thr letter may really mean 'yet again its gone round the class so we best let you know'.
If a child repeatedly gets nits and there's no sign of home doing anytging repeatedly about it we have to flag it as a concern.

OP it's the same with my 10 year old DGD's school. Her mum (my DD) regularly gets letters home about checking for nits. Which she does without fail. She has had them twice in the last year. It's an absolute pain as it means my DD and I have to check ourselves too,and when you have as much hair as we do,it's a bloody 2 hour job. It's always the same child in my DGD's class that is re-infecting everyone. The child is one of 8 kids and apparently the mother has said she has better things to do than spend hours checking 8 kids' hair for nits!

My kid had it for first time last weekend. Two lice and tons and tons of eggs I hadn't even noticed in his really thin short light hair. I'd checked him with nitty gritty comb week before, so all those eggs from just a week, so can see why infestations happen. Anyway he had treatment lotion and we've been combing each night, he will have repeat treatment tomorrow and another week of combing before back to regular weekly combing, which I might step up to twice a week.

It happens, but why on earth don't people check when they get notified it's in the class. I notified the school Monday and a letter went out.
I really think regular nit combing should be part of grooming routine for kids.