http://www.cdc.gov/parasites/pinworm/biology.html E. vermicularis (aka human pinworm) "Biology" http://www.cdc.gov/parasites/pinworm/biology.html http://www.cdc.gov/parasites/pinworm/biology.html Centers for Disease Control and Infection http://www.cdc.gov/parasites/pinworm/biology.html http://www.cdc.gov/parasites/pinworm/biology.html