Which parasite eggs are typically found in perianal specimens for diagnosis?

• A. Enterobius vermicularis
• B. Ascaris lumbricoides
• C. Necator americanus
• D. Trichuris trichiura

Answer: (A)

The main idea is that pinworm infection is diagnosed by detecting eggs around the anus. Female Enterobius vermicularis migrate to the perianal area at night to lay eggs, so collecting a sample from the skin near the anus (often with a sticky tape swab in the morning) will reveal these eggs under the microscope. This perianal scrap or tape test is the classic method for diagnosing pinworm because it specifically targets the site where the eggs are laid. The other parasites listed produce eggs that are typically found in stool samples rather than around the perianal skin, and their eggs have different appearances and diagnostic contexts, so they are not commonly detected this way.