Harr Parasitology Practice Test

Cysticercosis is a condition that arises when humans accidentally ingest the eggs of the pork tapeworm, Taenia solium. In this scenario, humans act as intermediate hosts rather than the definitive host, which is typically pigs. When the eggs are ingested, they hatch into larvae that can invade various tissues, particularly the muscles and the central nervous system, leading to various health problems.

This condition is significantly different from the other options listed. For example, trichinosis is caused by consuming undercooked meat that contains larvae of the Trichinella parasite, while ascariasis results from ingesting eggs of the Ascaris lumbricoides roundworm, where humans serve as definitive hosts. Strongyloidiasis is due to infection with the Strongyloides stercoralis worm, typically through skin penetration, which does not involve the ingestion of eggs. Thus, the unique mechanism of infection and human involvement in cysticercosis sets it apart as the correct response.