a1 Parasitology Department, Medical School, Tarbiat Modarres University, PO Box 14155-4838, Tehran, Iran
A total of 1590 human appendices were collected and examined histologically for evidence of pinworm infection. The incidence of infection in appendices was 2·39%. In examining 100 appendices by both the histological and the parasitological methods, 3 and 7 samples respectively were seen to be infected by pinworm.
(Accepted November 11 1992)