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IX. Selected Diseases caused by Multicellular Animal Parasites. A. Diseases caused by Flatworms B. Diseases caused by Roundworms. IX. A. Diseases caused by Flatworms. Schistosomiasis Caused by the fluke Schistosoma

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ix selected diseases caused by multicellular animal parasites
IX. Selected Diseases caused by Multicellular Animal Parasites

A. Diseases caused by Flatworms

B. Diseases caused by Roundworms

ix a diseases caused by flatworms
IX. A. Diseases caused by Flatworms
  • Schistosomiasis
    • Caused by the fluke Schistosoma
    • Intermediate host: snails, in which the larval form of Schistosoma develops
    • The larvae are released into the water, and burrow into the skin of their human hosts (usually through feet or legs, while wading)
    • Many organs may be affected, including liver & lungs
    • The parasite reaches maturity in the human host and reproduces. Its eggs are released in the urine.
ix a diseases caused by flatworms1
IX. A. Diseases caused by Flatworms
  • Tapeworms
    • Flatworms with segmented bodies
      • A head section with hooks (scolex) to attach to the intestinal wall
      • Multiple body segments (proglottids) that can number into the thousands
      • Each proglottid has a complete, functional reproductive system
ix a diseases caused by flatworms2
IX. A. Diseases caused by Flatworms
  • Tapeworms (cont.)
    • Beef tapeworm (Taenia saginata)
      • Intermediate host: cattle
      • Embryonic form is transmitted to humans in contaminated pork
      • Adult worm develops in human intestinal tract and eggs are shed in feces
      • Eggs are eaten by cattle where they hatch & infect beef muscle to complete the cycle
ix a diseases caused by flatworms3
IX. A. Diseases caused by Flatworms
  • Tapeworms (cont.)
    • Pork tapeworm (Taenia solium)
      • Intermediate host: swine
    • Fish tapeworm (Diphyllobothrium latum)
      • Intermediate host: Fish
      • Transmission similar to beef tapeworm
ix b diseases caused by roundworms
IX. B. Diseases caused by Roundworms
  • Ascariasis
    • Ascaris lumbricoides
    • Transmitted by ingestion of eggs in contaminated soil
    • Parasite grows and matures in the intestinal tract; eggs shed in feces
  • Pinworms
    • Enterobius vermicularis
    • Small roundworms, transmitted via contaminated soil in a similar manner as Ascaris
    • Painful itching around anus; often seen in small children
ix b diseases caused by roundworms1
IX. B. Diseases caused by Roundworms
  • Trichinosis
    • Trichinella spiralis
    • Primarily transmitted via undercooked pork
    • The embryos develop in the intestinal tract and then travel to muscle tissue where they encyst
    • When the muscle tissue is eaten, the larval cysts hatch and complete their development in the intestinal tract of the next host