Pinworm infection , also known as enterobiasis , is a human parasitic disease caused by the pinworm .  The most common symptom is itching in the anal area.  This can make sleeping difficult.  The period of time from swallowing eggs to the appearance of new eggs around the anus is 4 to 8 weeks.  Some people who are infected do not have symptoms. 
Dr. Mersch received his Bachelor of Arts degree from the University of California, San Diego, and prior to entering the University Of Southern California School Of Medicine, was a graduate student (attaining PhD candidate status) in Experimental Pathology at USC. He attended internship and residency at Children's Hospital Los Angeles.