De Worm is a single dose treatment for the whole family. Because the eggs are so easily spread, and not everyone shows symptoms, treat the whole family at once.
Threadworm is highly contagious and is the only common worm infestation found in the population of New Zealand. Evidence of infestation is the presence of tiny white threads around the anal region, along with itching in the area, restless sleep, grinding teeth and irritability. All members of the family should be treated at the same time.