my daughter is 4 years 6 months old. she is often complaining of anal itching. I feel it's due to worm infestation, but Iam administering albendazol syrup in every 3-4 months. when the syrup is given, she stops complaining of itching for 2 months, and again she starts getting anal itching. I would like to know how frequently we can give albendazol syrup to kids, and what other measures can be followed to prevent worm infestation