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Protozoan Diseases of the Digestive System quiz

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  • What protozoan causes giardiasis and what is its main structural feature?
    Giardiasis is caused by Giardia duodenalis, a flagellated protozoan that uses its flagella to move.
  • What are the two life stages of Giardia duodenalis?
    The two life stages are the trophozoite, which attaches to the small intestine, and the cyst, which survives outside the body.
  • How does the cyst form of Giardia contribute to its transmission?
    The cyst form is resistant to harsh environments and allows the organism to survive outside the body, facilitating fecal-oral transmission.
  • Why is Giardia considered partially resistant to some water treatments?
    Giardia cysts are partially resistant to chlorine and UV treatments, so improper water treatment may not kill them.
  • What is the most common route of transmission for giardiasis?
    Giardiasis is most commonly transmitted via ingestion of cysts in contaminated water through the fecal-oral route.
  • How can giardiasis be acquired in outdoor settings in developed countries?
    It can be acquired by drinking untreated water from rivers or streams contaminated by animal feces.
  • What is zoonotic transmission in the context of giardiasis?
    Zoonotic transmission occurs when Giardia is transmitted from animals to humans, such as through contaminated water.
  • What are the typical symptoms of giardiasis?
    Symptoms include greasy, foul-smelling diarrhea, gas, nausea, and sometimes vomiting.
  • How long can symptoms of giardiasis last, and what is a potential complication of chronic infection?
    Symptoms can last for weeks, and chronic infection may lead to nutrient malabsorption.
  • What is a distinctive characteristic of the stool in giardiasis?
    The stool is often greasy and has a distinctive rotten egg smell.
  • How is giardiasis diagnosed in the laboratory?
    Diagnosis is made by microscopic examination of feces for cysts or by antigen tests for Giardia proteins.
  • What are the main drugs used to treat giardiasis?
    Metronidazole and nitazoxanide are the primary drugs used for treatment.
  • Are most people with giardiasis symptomatic or asymptomatic?
    Many carriers of giardiasis are asymptomatic and may not know they are infected.
  • Is there a vaccine available for giardiasis?
    No, there is currently no vaccine for giardiasis.
  • What are key prevention strategies for giardiasis, especially when traveling or camping?
    Prevention includes drinking properly treated water and ensuring water is boiled or filtered when outdoors.