how big are pinworms
Pinworm infection is the most common type of intestinal worm infection in the United States and one of the most common worldwide. Pinworms are thin and white, measuring about 1/4 to 1/2 inch (about 5 to 13 millimeters) in length. While the infected person sleeps, female pinworms lay thousands of eggs in the folds of skin surrounding the anus.