Threadworm can be difficult to eradicate. The advice given is usually to treat the whole family (and even close friends who may have a similar problem) all at the same time. Retreatment is advised 3 weeks later. Most of the time the infection is difficult to eradicate, because children are constantly re-infected via family or friends after the infection has been eradicated. Therefor, the best answer is to try and treat everybody at the same time.
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