Taenia solium

Paul G. Auwaerter, M.D., Trevor A. Crowell, M.D.

MICROBIOLOGY

  • Taenia solium (pork tapeworm) and Taenia saginata (beef tapeworm) are intestinal cestodes.
    • Cysticercosis including neurocysticercosis is the main concern of these tapeworm infections, caused by Taenia solium.
  • Life cycle: additional details in CDC illustration.
    • Eggs or gravid proglottids are passed in the stool.
    • Pigs ingest contaminated vegetation, and oncospheres hatch in the intestine.
    • Organisms invade the intestinal wall, migrate to striated muscles, and develop into cysticerci.
    • Humans ingest raw or undercooked infected meat, and gastric juices activate larvae, leading to evagination of scolex and attachment to the small intestine.
    • Over 2-4 months, cysticercus develops into an adult tapeworm; may grow up to 7 meters in length.
  • Adults have up to 1,000 proglottids, each containing 50,000-100,000 eggs.
  • Pigs are intermediate hosts; humans acquire intestinal tapeworm by eating undercooked pork containing cysticerci.
  • Humans acquire disseminated cysticercosis by ingesting eggs in food/water contaminated by human tapeworm carriers.

There's more to see -- the rest of this topic is available only to subscribers.

Last updated: August 8, 2022