Can people have persistent pinworm infection even when taking meds regularly at two week intervals & good hygiene, white bits in stool won't go?

Re-Infection Common: Persistent infection is common with pinworms and is commonly due to re-infection. In addition to re-treatment, do the following: Change underclothes and bed sheets, bathe in the mornings, wash hands/clean nails before handling food, keep fingernails short, avoid nail biting, avoid scratching perianal area, and all household members should be treated as a group. Follow closely with your doctor.