<prompt> Child having perianal pruritus with following eggs is due to:E. vermicularisAscarisAnkylostoma duodenaleS. stercoralis  <response>: Ans. is a i.e., E. VermicularisRef: Harrison, 19the, p. 1416 Most pinworm infections are asymptomatic, the others name of Enterobius vermicularis are Pinworm, threadworm, seatworm. Perianal pruritis is the cardinal symptom. The itching is worse at night and disturbes sleep. Heavy infections can cause abdominal pain and weight loss. NIH swab is used for diagnosis. 