So recently my Daughter (age 9) has had a horrible case of persistent threadworms. Was first treated via (Ovex) Mebendazole which I was given over the counter at the pharmacy. One week later behold, more worms. I have done everything and more necessary- washed all houses linen in boil wash; made sure everyone washes their hands before eating and after going to the toilet; treated everyone in the house. We are a very clean household and my daughter has had impeccable hygiene throughout. Thankfully no one else is showing symptoms of it but, I think that it only manages to isolate her more. She keeps blaming herself for it and being far too harsh about it; I have told her that she is doing everything that she can and it’s not her fault. Although, I am worried that I have solidified the idea of it being someone’s fault in her head. When it’s not in any case. Went to see a doctor at a walk in clinic- they gave her a longer course if the same medicine. We have had them in the past but this time it’s ridiculous. Why won’t the go away. I honestly feel like a horrible mother because I can’t go anything to help her. Has she built up an intolerance to the medicine?? Please help me!!