PARASITOLOGY EXAM ANSWERS |
COMPLETE STUDY GUIDE AND PRACTICE
QUESTIONS
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Updated 2026 Questions and Answers
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,Pathognomonic A characteristic of a disease that is so distinct and specific to that disease, that a diagnosis
can be made based upon that one characteristic.
Excystation Transformation of a cyst stage into a trophozoite stage.
How is Amebiasis spread? Fecally contaminated food or water. Anal sex. (Disease is associated with lower SES and
more common in young adults)
What is the incubation period of Amebiasis? 2-4 weeks.
What intestinal protozoan causes Amebiasis? Entamoeba hystolytica.
Excystation with Amebiasis occurs where? Duodenum.
What is a pathognomonic characteristic of Amebiasis? Presence of E. hystolytica trophozoites with ingested RBC's.
Some facts about Amebiasis: Can cause swelled areas along the colon: ameboma. May infect the liver if it gets outside
of the intestines.
Amebiasis is: an amoebae, a flagellate or coccidia? Amoebae.
How many fecal specimens are recommended for diagnosis? Three within one week, at least every other day.
What is normal procedure for a negative O&P result? Ask them to submit another stool sample.
Symptoms of Giardiasis? Can be chronic, acute or asymptomatic. Steatorrhea. Abdominal cramps. Bloating. Loose,
greasy stools. Fatigue. Weight loss.
What intestinal protozoan causes Giardiasis? Giardia lamblia.
, How do we prevent Giardia and Cryptosporidium from getting Filtration.
in our water?
Morphology of Giardia trophs: Heart shaped and symmetric. 10-20 micrometers. Four pair of flagella. Two nuclei.
"Swaying" or "Dancing" movement of trophs in fresh specimens.
How is Giardiasis spread? Fecally contaminated food or water. Anal sex. Seasonal in the US (Summer-Fall). More
common in children and associated with lower SES.
What is the incubation period of Giardiasis? 7-10 days.
Giardiasis is: an amoebae, a flagellate or coccidia? Flagellate.
Symptoms of Cryptosporidiosis: Diarrhea. May be severe in immunocompromised individuals (HIV, etc.) Anorexia.
Vomiting. Malaise. Fever. Nausea.
What intestinal protozoan causes Cryptosporidiosis? Cryptosporidium parvum.
How is Cryptosporidiosis diagnosed? Identification of C. parvum. Identification of oocysts in smears. Modified acid fast stain.
How is Cryptosporidiosis spread? Fecally contaminated food or water. Daycare settings. Prevalence varies by SES.
Waterborne outbreak in Milwaukee 1993. Carried in the intestines of many animals.
Worldwide.
What is the incubation period of Cryptosporidiosis? About one week.
Cryptosporidiosis is: an amoebae, a flagellate or coccidia? Coccidia.
Suppurative Producing or associated with generation of pus.
Keratitis Inflammation of the cornea causing watery, painful eyes and blurred vision.
Karyosome A mass of chromatin; position and morphology used to differentiate intestinal protozoa.
Meningoencephalitis Inflammation of the brain, spinal cord and their meninges, that can be caused by free-
living amoebas of Naegleria fowleri.
COMPLETE STUDY GUIDE AND PRACTICE
QUESTIONS
| GRADED A+ | GUARANTEED SUCCESS
Updated 2026 Questions and Answers
100% Verified Exam Prep
,Pathognomonic A characteristic of a disease that is so distinct and specific to that disease, that a diagnosis
can be made based upon that one characteristic.
Excystation Transformation of a cyst stage into a trophozoite stage.
How is Amebiasis spread? Fecally contaminated food or water. Anal sex. (Disease is associated with lower SES and
more common in young adults)
What is the incubation period of Amebiasis? 2-4 weeks.
What intestinal protozoan causes Amebiasis? Entamoeba hystolytica.
Excystation with Amebiasis occurs where? Duodenum.
What is a pathognomonic characteristic of Amebiasis? Presence of E. hystolytica trophozoites with ingested RBC's.
Some facts about Amebiasis: Can cause swelled areas along the colon: ameboma. May infect the liver if it gets outside
of the intestines.
Amebiasis is: an amoebae, a flagellate or coccidia? Amoebae.
How many fecal specimens are recommended for diagnosis? Three within one week, at least every other day.
What is normal procedure for a negative O&P result? Ask them to submit another stool sample.
Symptoms of Giardiasis? Can be chronic, acute or asymptomatic. Steatorrhea. Abdominal cramps. Bloating. Loose,
greasy stools. Fatigue. Weight loss.
What intestinal protozoan causes Giardiasis? Giardia lamblia.
, How do we prevent Giardia and Cryptosporidium from getting Filtration.
in our water?
Morphology of Giardia trophs: Heart shaped and symmetric. 10-20 micrometers. Four pair of flagella. Two nuclei.
"Swaying" or "Dancing" movement of trophs in fresh specimens.
How is Giardiasis spread? Fecally contaminated food or water. Anal sex. Seasonal in the US (Summer-Fall). More
common in children and associated with lower SES.
What is the incubation period of Giardiasis? 7-10 days.
Giardiasis is: an amoebae, a flagellate or coccidia? Flagellate.
Symptoms of Cryptosporidiosis: Diarrhea. May be severe in immunocompromised individuals (HIV, etc.) Anorexia.
Vomiting. Malaise. Fever. Nausea.
What intestinal protozoan causes Cryptosporidiosis? Cryptosporidium parvum.
How is Cryptosporidiosis diagnosed? Identification of C. parvum. Identification of oocysts in smears. Modified acid fast stain.
How is Cryptosporidiosis spread? Fecally contaminated food or water. Daycare settings. Prevalence varies by SES.
Waterborne outbreak in Milwaukee 1993. Carried in the intestines of many animals.
Worldwide.
What is the incubation period of Cryptosporidiosis? About one week.
Cryptosporidiosis is: an amoebae, a flagellate or coccidia? Coccidia.
Suppurative Producing or associated with generation of pus.
Keratitis Inflammation of the cornea causing watery, painful eyes and blurred vision.
Karyosome A mass of chromatin; position and morphology used to differentiate intestinal protozoa.
Meningoencephalitis Inflammation of the brain, spinal cord and their meninges, that can be caused by free-
living amoebas of Naegleria fowleri.
