PARASITOLOGY Flashcards
- Uninucleated cysts are likely to be produced by what protozoan species?
I. butschlii 2. R. intestinalis 3. C. mesnili 4. E. hominis
a. 1&3
b. 2&4
c. 1, 2 & 3
d. 1, 2, 3 & 4
c. 1, 2 & 3
- Observation of C-shaped trypomastigotes can be diagnostic of which of the following diseases?
a. Chagas Disease
b. East African Sleeping Sickness
c. Piroplasmosis
d. Kala-azar fever
e. NONE OF THE ABOVE
e. NONE OF THE ABOVE - WEST AFRICAN SLEEPING SICKNESS CAUSED BY T. BRUCEI GAMBIENSE
- In the life history of plasmodium, man serves as what type of host?
a. Reservoir
b. Definitive (Female anopheles)
c. Paratenic
d. Intermediate
d. Intermediate
- Sandflies of the genus Phlebotomus are likely to transmit which of the following
a. Chagas Disease (TRYPANOSOMA CRUZI - VECTOR: REDUVIID BUG)
b. East African Sleeping Sickness (TRYPANOSOMA BRUCEI RHODESIENSE - VECTOR: TSE-TSE FLY)
c. Piroplasmosis (BABESIA MICROTI - VECTOR: IXODES TICKS)
d. Kala-azar fever (LEISHMANIA SPP.)
d. Kala-azar fever (LEISHMANIA SPP.)
- Which of the following structures is typical in trophozoites of E. histolytica?
a. Single nucleus with a small karyosome
b. Unevenly distributed peripheral chromatin
c. A and B only
d. Chromatoidal body
e. Glycogen mass
a. Single nucleus with a small karyosome
- One difference between E. hartmanni and E. histolytica is which of the following?
a. Smaller size of E. histolytica trophozoites
b. Nuclear structure and peripheral chromatin
c. Presence of pseudopods
d. Non-hematophagous nature of E. hartmanni trophozoites (no ingested RBC)
d. Non-hematophagous nature of E. hartmanni trophozoites (no ingested RBC)
- Iodamoeba butschlii cyst typically
a. contain four nuclei - uninucleated
b. Have a small karyosome in a central position - large karyosome in central position
c. Lack chromatid bars
d. Lack glycogen mass - with glycogen mass
e. B & C
c. Lack chromatid bars
Iodamoeba butschlii has SINGLE NUCLEUS consists of a large, usually central karyosome surrounded by refractive achromatic granules, which are often not distinct, even when the trophozoite is permanently stained.
- Which of the following statements is not true about amoebic trophozoites?
a. Delicate and motile - true
b. Replicative forms – (form that multiplies) true
c. Resistant to iodine
d. Easily destroyed by gastric juice – true
e. B & C only
c. Resistant to iodine
- What is the diagnostic stage of E. histolytica in specimens obtained from extraintestinal amoebiasis (??)
a. Cyst
b. Trophozoite
c. Precyst
d. All of these
e. A & B only
b. Trophozoite
- What is the mode of transmission of N. fowleri encephalitis?
a. Intranasal
b. Direct Contact
c. Through breaks in the skin
d. All of these
a. Intranasal - ENTERS THE BODY VIA NASAL MUCOSA
- Characteristic motility of Chilomastix mesnili
a. Directional tumbling
b. Falling leaf-like
c. Spiral jerky
d. Sluggish
e. NONE OF THE ABOVE
c. Spiral jerky
- Associated with the Gay bowel syndrome
a. E. hominis
b. D. fragilis
c. G. lamblia
d. T. vaginalis
c. G. lamblia - SEXUALLY TRANSMITTED THRU ANAL/RECTAL INFECTION DUE TO TRAUMA
- Diagnostic stage of Leishmania spp.
a. Amastigote
b. Promastigote
c. Epimastigote
d. Trypomastigote
a. Amastigote (DIAGNOSTIC FOR LEISHMANIA AFFECTING HUMANS)
- Which of the following protozoan parasites is transmitted by Reduviid bugs?
a. T. cruzi
b. T. brucei gambiense (Glossina - Tse-tse fly)
c. L. donovani (Phlebotomus - Sandfly)
d. T. gondii (No vector; MOT is ingestion of oocyst)
a. T. cruzi
- An axostyle extending beyond the parasite’s body is a unique feature of what protozoa?
a. Retortamonas
b. Trichomonas
c. Giardia
d. Balantidium
e. Enteromonas
b. Trichomonas (extends beyond the posterior part of T. hominis)
- String test/Entero test can be a useful test in the detection of which of the following protozoan parasites?
a. E. hominis
b. D. fragilis
c. G. lamblia
d. T. vaginalis
e. C & D only
c. G. lamblia - STRING TEST IS USED to detect the presence of parasites in the upper part of the small intestine. G. LAMBLIA AFFECTS DUODENUM AND JEJUNUM WHICH IS FOUND AT THE UPPER PART OF
SMALL INTESTINE
- Which of the following intestinal protozoa can produce flask shaped ulcers in the GIT
a. E. coli
b. B. coli
c. E. histolytica
d. C. parvum
e. C. cayetanensis
c. E. histolytica - Zeibig Chapter 3 page 49
- Auto-fluorescence is exhibited by which of the following protozoan parasites? Use choices in #47
a. E. coli
b. B. coli
c. E. histolytica
d. C. parvum
e. C. cayetanensis
e. C. cayetanensis - OOCYST AUTO FLUORESCE UNDER UV LIGHT MICROSCOPY - ZEIBIG Chapter 7 pg 175
- Eccentrically located/off center karyosome can be noted in which of the following protozoan trophozoites?
a. E. nana - large and irregular, blot-like
b. E. histolytica - bull’s eye
c. I. butschlii - achromatic granules
d. E. coli
e. R. intestinalis
d. E. coli
- Skin biopsy can be a useful technique to detect which hemoflagellates?
a. T. brucei gambiense - skin inoculation
b. T. cruzi - skin inoculation
c. L. brasiliensis - tissue biopsy
d. L. tropica - fluid underneath the ulcer bed
e. NOTA
d. L. tropica - fluid underneath the ulcer bed
- How far down the body length does the Trichomonas tenax undulating membrane extend?
a. ¼
b. ½
c. ¾
d. Full body
c. ¾
- Treatment is always indicated for patients when E. hominis is present on parasite examination
a. True
b. False
b. False
- When E. hominis cyst contain more than one nucleus, where do they tend to be positioned within the cytoplasm?
a. Center
b. Around the periphery of the organism
c. At the opposite end of the cell
d. Throughout the organism
c. At the opposite end of the cell
- Trichomonas hominis can be transmitted by which of the following?
a. Contaminated milk
b. Bite of an infected mosquito - plasmodium spp.
c. Ingestion of an embryonated ovum
d. Ingestion of undercooked meat
a. Contaminated milk
- The specimen of choice for the recovery of T. homins is which of the following?
a. Stool
b. Urine
c. Intestinal contents
d. Gastric contents
a. Stool
- The permanent stain of choice for observing the nuclear features of D. fragilis is which of the following?
a. Trichrome - amoeba
b. Iodine - I. butschii
c. Saline
d. Iron hematoxylin
d. Iron hematoxylin
- Which of the following are key morphologic characteristics of C. mesnili
a. Round 4 to 8 nuclei
b. Oval and presence of a cytosome
c. Round and presence of an axoneme
d. Lemon-shaped and presence of a cytosome
d. Lemon-shaped and presence of a cytosome
- G. intestinalis trophozoite attach to the mucosa of the duodenum and feed with the assistance of this morphologic structure
a. Sucking disk
b. Axostyle
c. Axoneme
d. Nucleus
a. Sucking disk
- Which specimen type and collection regimen would be most appropriate for the diagnosis of G. intestinalis?
a. One stool sample
b. Two stool samples
c. Multiple stool samples collected on subsequent days
d. One stool sample and one blood sample
c. Multiple stool samples collected on subsequent days
- The presence of non-pathogenic flagellates is important because it suggest that:
a. The patient will develop clinical signs and symptoms
b. Only cyst forms will be recovered in patient’s samples
c. Parasite will invade multiple organ system in the body
d. Contaminated food or drink was consumed by the patient
d. Contaminated food or drink was consumed by the patient
