MIC 541-Exam 5-Parisitology 13
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Do Trematodes usually cause infections in the U.S.?
What infection was discussed in class as a U.S. Trematode disease?
Swimmer's itch in the northeast
What is the most important Helminth disease in the world?
What is Schistosomiasis?
Chronic infection of Trematodes
Why is Schistosomiasis not common in the U.S.?
- Lack of proper snail
What is required for Schistosomiasis?
Proper snail intermediate
Describe the reproduction of Trematodes:
- Separate sexes
- Mate in the liver
- Eggs excreted by host feces/urine
- Hatch and produce ciliated larvae
- Penetrates snail
- Sexually reproduce in snail
- Tail bearing offspring penetrate human skin
- Mature in human host
Where are Trematode infections most prevalent?
Sub Saharan Africa
Where would you find Schistosoma haematobium?
Africa Middle east
Where would you find Schistosoma mansoni?
Where would you find Schistosoma japonicum?
Where do Schistosoma mate?
- In snails to produce tail bearing offspring
- In Human livers to produce ciliated offspring
What are most of symptoms of Schistosoma due to?
- Host response:
- Allergic reaction
What is the worst possible outcome of Schistosoma infections?
Liver damage leading to death
How do you treat Schistosoma infections?
What are normal signs/symptoms of Schistosoma infections?
- Allergic rash
- Tissue granulomas
- abdominal pain
- Liver damage
Where do granulomas form with a Schistosoma infection?
Around the eggs in the tissue of humans
Why does Schistosomiasis cause liver damage?
Millions of eggs are released into the liver causing fibrosis
What are the general characteristics of Arthropods?
- No vector
- Temporary infections
- Often carry bacterial infections
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