Pinworms are tiny white or ivory-colored thread-like worms, measuring 1/4-1/2" long.
Females crawl out of the anus at night, lay their microscopic eggs in the perianal area, & then die. This activity can cause intense itching & irritation from scratching.
This highly contagious parasite is acquired by contaminated food, bedding, underwear, clothing, water, house dust, & human contact.
Each female lays over 15,000 eggs that are infective immediately or within a few hours.The microscopic eggs become airborne & float everywhere.
Sometimes the adults appear as tiny pieces of thread in the first morning stool, clinging to toilet paper, undergarments, or the perianal area.
If one person in a household has pinworms, it's common to find others infected as well.
Even without symptoms, all household members should be treated (their treatment is for a shorter period; see protocol below for details).
Drug guides usually show low-dose, one-shot, or short-term plans. But studies show high failure & reinfection rates with those methods.
Also, forum members frequently complain about high failure rates w/those methods.
The Mebendazole (Vermox) drug protocol, that I personally used myself, calls for a higher dosage (100 mg twice daily) for longer periods of time (7 days on, 7 days off, repeated for 2 or more cycles): http://curezone.com/forums/fm.asp?i=1564827#i.