Most common presenting symptom of thread worm infection amongst the following is -
Threadworm causes enterobiasis The worm produces intense irritation and pruritus of the perianal and perineal area when it crawls out of anus to lay eggs.This leads to scratching and excoriation of skin around anus. Ref:panikers textbook of Medical parasitology 8th edition page 196
Abdominal pain
Irritation and pruritus of perianal area
Uicaria
Vaginitis
parasitology