Discovered on fri eve that dd (age 4) has threadworms. Have treated us all and following all recommendations etc. Went into school this am to be a responsible parent and tell them, class teacher wasn't in yet so spoke to teaching assistant. Not sure how long she's been there but certainly since dd started and am pretty sure she has kids of her own, and school nurse talked about threadworms at parent induction and stats are that 40./. Of primary kids will have threadworms at any one time....I told TA and she said what's that then? I've never come across that! I was v shocked! Opinions?