RESUMEN
Enterobius vermicularis is a nematode with a peculiar biological cycle, thus requiring a special diagnostic technique. In order to determine the prevalence of E. vermicularis infection among schoolchildren in Ciudad Bolívar, Venezuela, 282 children aged 5 - 14 years old were evaluated between november 1995 and august 1996 by the Graham technique (three perianal swabs with adhesive cellulose tape). The prevalence of enterobiasis in the studied children was estimated 19,1 percent (54/282). There was no difference between sexes (p>0,05), but there was a difference between ages (x² = 13,8; 1.g.= 4), being the infection more frequent between 5 and 8 years. Symptoms were observed in 90,7 percent of the schoolchildren. Anal pruritus was the most common clinical finding (81,6 percent). Other less frequent manifestations were enuresis (28,6 percent) and vulvitis in girls (26,1 percent). This intestinal parasitosis occurs with high frequency among schoolchildren in Ciudad Bolívar with characteristic and identifiable symptoms in most cases. The Graham method must be used for its diagnosis. This test is not routinely performed in our laboratories unless specifically requested by the attending physician