How do you deal with threadworms in a child who sucks their thumb? We all took the medication two weeks ago and me, DH and DD (7) were clear after a few days but I've just needed to give my younger DD a second dose as I saw them on her the other day. I'm sure the thumbsucking is contributing to reinfection but I don't know how to stop it. She is nearly 4 and does school hours in a nursery class and has just started after school club two days a week, so is obviously feeling quite tired. She sucks her thumb for comfort and when she is tired during the day rather than at night, so I can't really put thumb-guards on her when she is at school. I haven't tried the nasty tasting stuff you paint on yet as I think she'd just suck it off, but if anyone has had success with that, please let me know.