Pathogenic Exam 3

Which of the following cysts are round in shape, contain up to 4 nuclei in mature stage, and have smooth cigar-shaped chromatoidal bars?

Endolimax nana

Entamoeba coli

lodamoeba butschlii

Entamoeba histolytica

Entamoeba histolytica

Trophozoites of Entamoeba histolytica have the following characteristics EXCEPT:

actively motile directional motility

cigar-shaped chromatoidal bars

ingested RBC's may be found in the cytoplasm

eccentric karyosome

eccentric karyosome

Which of the following characteristics are used to differentiate Entamoeba coli from Entamoeba histolytica?

all of the above are true

cyst stage contains up to 8 nuclei

chromatoidal bars have jagged edges

nucleus has an eccentric karyosome

all of the above are true

The intestinal flagellate that is pathogenic for man and causes "Travelers Diarrhea" is:

Enterobius vermicularis

Giardia lamblia

Trichomosis vaginalis

Chilomastix mesnili

Giardia lamblia

Which is NOT a characteristic of Giardia lamblia?

trophozoite has a rounded anterior and a pointed posterior end (like a teardrop), with 4 pair of flagella, and 2 nuclei it is ciliated

occurs in the trophozoite and cyst stage

a mature cyst has four nuclei

trophozoite has a rounded anterior and a pointed posterior end (like a teardrop), with 4 pair of flagella, and 2 nuclei it is ciliated it is ciliated

Which of the following does NOT have a cyst stage?

Trichomonas vaginalis

Giardia lamblia

Entamoeba histolytica

lodamoeba butschlii

Trichomonas vaginalis

Which of the following are characteristics of Balantidium coli?

it contains both a macro and a micro nucleus

it is the largest intestinal protozoan parasite of man

it is a ciliated protozoan

all of the above are characteristics of B. coli

all of the above are characteristics of B. coli

A urine specimen was examined and found to contain an organism with the following characteristics:

Bilateral symmetry

Undulating membrane extending 1/2 the length of the body anterior flagella has jerky movements

The most likely ID of this parasite is:

Trichomonas hominis

Trichomonas vaginalis

Chilomastix mesnilii

Giardia lamblia

Trichomonas vaginalis

In an iodine preparation of feces an amebic cyst appears to have a basket nucleus and a large glycogen mass that stains reddish brown. What is the most probable ID of this parasite?

Entamoeba hartmanni

Naegleria fowleri

lodamoeba butschlill

Entamoeba histolytica

lodamoeba butschlii

Primary amebic meningoencephalitis (PAM), diagnosed in CSF is caused by:

Naegleria fowleri

Endolimax nana

Entamoeba coli

Dientamoeba fragilis

Naegleria fowleri