811 W. John Street, Yorkville, IL 60560
For 24/7 Mental or Public Health Emergencies, call 630-553-9100
Mon 8:30am - 4:30pm  •  Tue - Thu 8:30am - 7:00pm  •  Fri 8:30am - 4:30pm

Pinworm Disease




Intestinal parasite (nematode)

Signs and Symptoms

Pinworm is a common intestinal infection that often causes no symptoms. There may be anal itching, disturbed sleep, irritability and sometimes a secondary infection of the scratched skin. Worms are most likely to be seen in anal region while sleeping or immediately after waking in the morning.

Incubation Period

Variable, may be three to six weeks or longer. Time from contact until the development of signs and symptoms. Life cycle of parasite is 4 to 6 weeks. Signs and symptoms may not be evident for months.

Mode of Transmission

Direct transfer of eggs by hand from anus to mouth and swallowed by the same or new host, or indirectly through clothing, bedding, and food or other articles contaminated with eggs of the parasite. Airborne eggs may be inhaled then swallowed.

Period of Communicability

Usually about three weeks

Preventive Measures

Use of Universal/Standard Precautions including education on proper hand washing, toileting, personal hygiene, discourage scratching bare anal area and nail biting.

Implications for School

Suspected cases should be referred to parents. Unless symptoms are severe, immediate exclusion is not necessary. Emphasize good hygiene. Students are required to have a doctor’s note to return to school.

Serving the Residents of Kendall County Since 1966
811 W. John Street, Yorkville, IL 60560   •   630-553-9100