What if the Pinworm Infection Occurs Again?

Last Editorial Review: 1/11/2018

Ask the expert

I have already treated my children (and myself) for pinworm. What if the pinworm infection occurs again?

Doctor's response

If the pinworm infection occurs again, the infected person should be treated with the same two-dose treatment.

Close family contacts should also be treated. If the infection occurs again, you should search for the source of the infection. Playmates, schoolmates, close contacts outside the house, and household members should be considered.

Each infected person should receive the usual two-dose treatment. In some cases it may be necessary to treat with more than two doses. One option is four to six treatments spaced 2 weeks apart.

This answer is based in part on information from the Division of Parasitic Diseases of the National Center for Infectious Diseases of the U.S. Centers for Disease Control and Prevention (the CDC).

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