MIC 541-Exam 5-Parisitology 3

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What is a Cyst and what is it's purpose?
- Non-motile form of protozoan
- Cyst well = distinct protective membrane
- Facilitates host to hot transmission
What is excystation?

Emergence of trophozoite from a cyst
What is the term for the emergence of a trophozoite from a host?

Excystation
What is the cause of amebic dysentary?

Entamoeba histolytica
what does Entamoeba histolytica cause?

Amebic dysentary
What is the worldwide infection rate of Entameoba hitsolytica?

1%
What groups are most likely to be infected with Entamoeba histolytica?
- Travelers
- immigrants to the U.S.
- institutionalized
What percent of people with an infection of Entamoeba histolytica have clinical symptoms?

10-20%
What medical issues increase the symptoms of Entamoeba histolytica?
- Malnutrition
- Childhood
- Steroid therapy
- Pregnancy
- AIDS
What histological characteristics would you expect for Entamoeba histolytica?
- Water expelling vacuoles
- Diameter of about 10-20 um
How is Entamoeba histolytica transmitted?

Fecal oral route
What is the treatment for Entamoeba histolytica?
- Metronidizole
- iodoquinol
- Paromycin
What would you treat with metronidazole, paromycin and iodoquinol?

Entamoeba histolytica
What does Entamoeba histolytica look like at the organ level?
- Cause liver abscesses
- Flask shaped ulcers in the colonic mucosa
What parasite causes flask shaped ulcers in the colonic mucosa and liver abscesses?

Entamoeba histolytica
What type of Parasite is Entamoeba histolytica?

Protozoa - Ameba
What type of parasite is Acanthamoeba Keratitis?

Protozoa-Ameba
What areas of the body does Acanthamoeba Keratitis infect?

Eye
What is a predisposing factor to infection with Acanthamoeba keratitis?

Contact lense wearers 85%
How do you prevent Acanthamoeba keratitis infections?
- Don't wear contact lense in the shower or swimming
- Don't reuse contact lense solutions
- Replace contact lense storage case every 3 months

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MIC 541-Exam 5-Parisitology 3

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MIC 541-Exam 5-Parisitology 3

Updated

5/7/2013, 5:43:24 PM

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