Type your tag names separated by a space and hit enter
Official website of the Johns Hopkins Antibiotic (ABX), HIV, Diabetes, and Psychiatry Guides, powered by Unbound Medicine. Johns Hopkins Guide App for iOS, iPhone, iPad, and Android included. Explore these free sample topics:
-- The first section of this topic is shown below --
- Taenia saginata (beef tapeworm) and Taenia solium (pork tapeworm) are intestinal cestodes transmitted by ingestion of undercooked meat
- Epidemiology: T. saginata is the most common and most widely distributed human tapeworm, infecting 60 million people worldwide; endemic throughout Latin America, Africa, Central Asia and the Middle East. Less common in Europe and southeast Asia; uncommon in Australia and U.S.
- Life cycle:
- Eggs or gravid proglottids are passed in stool.
- Cattle 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 jejunum
- Over 2-3 months, cysticercus develops into an adult tapeworm; may grow up to 10 meters in length and live up to 25 years.
- Adults may have 1,000-2,000 proglottids, each containing tens of thousands of eggs, and a distinctive scolex with 4 disks.
- Eggs are spherical, thick walled, radially striated and measure 30-35 microns in diameter.