Clinical significance
Pinworms (Enterobius vermicularis), also known as threadworms, cause the most common human intestinal parasitic infection, affecting about 10% of children; the worms live in the large intestine. The female parasites lay thousands of eggs around the anus, especially in the morning, causing intense itching. Infestation spreads through person-to-person contact; self-reinfection is also possible.
Clinical indications
Suspected infestation
Preparation
To look for the parasite’s eggs (sticky tape or “Scotch” test), apply a strip of clear adhesive tape to the skin around the anus in the evening and leave it in place overnight; remove it in the morning and stick it onto a glass slide, which must then be sent to the laboratory.
Notes
Examining at least 3 sticky tape samples gives a diagnosis in at least 90% of infestations. To rule out infestation, at least 5 of these tests must be negative.