A 6-year old child who presented with perianal pruritus, excoriation of skin and nocturnal enuresis was found to be infected with a parasite causing autoinfection. The causative agent is diagnosed by the -
The causative agent is Enterobius vermiculais & is diagnosed by NIH swab or perianal swab moistened with saline ie by applying the adhesive surface of cellophane tape to perianal skin in the morning & then this is examined on a glass slide inder microscope. Reference: Harrison20th edition pg 1102
NIH swab method
String test
Hetrazan test
Encysted larvae on muscle biopsy
Infection