[Elizabeth_Zeibig]_Clinical_Parasitology__A_Practi(z-lib.org)

CHAPTER 3 The Amebas
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3-4. Classify the individual ameba as intestinal
or extraintestinal. (Objective 3-4)
Entamoeba histolytica
Entamoeba hartmanni
Entamoeba coli
Entamoeba polecki
Endolimax nana
Iodamoeba bütschlii
Entamoeba gingivalis
Naegleria fowleri
Acanthamoeba species
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3-5. Describe the typical life cycle of an intestinal
ameba. (Objective 3-5 A)
3-6. Compare the life cycles of Entamoeba
gingivalis and Naegleria fowleri. (Objective
3-5C)
3-7. Amebic dysentery is caused by: (Objective
3-6)
A. Entamoeba histolytica
B. Entamoeba coli
C. Entamoeba gingivalis
D. Endolimax nana
3-8. Identify and describe the clinical significance
associated with each of the following
amebas. (Objective 3-6)
A. Entamoeba histolytica
B. Entamoeba coli
C. Naegleria fowleri
D. Acanthamoeba species
3-9. True/False. Treatment for patients with
asymptomatic intestinal amebiasis is not
recommended. (Objective 3-7)
A. True
B. False
3-10. Primary amebic meningoencephalitis is
primarily caused by: (Objective 3-6)
A. Entamoeba histolytica
B. Naegleria fowleri
C. Entamoeba gingivalis
D. Acanthamoeba spp.
3-11. Match each ameba (column A) with the
corresponding specimen of choice for its
recovery (column B). (Objective 3-8)
Column A
Column B
1. Entamoeba histolytica ___ A. Stool
2. Entamoeba coli ___ B. Spinal fluid
3. Endolimax nana ___ C. Mouth
scrapings
4. Entamoeba gingivalis ___ D. Corneal
scrapings
5. Acanthamoeba spp.
6. Naegleria fowleri
3-12. Describe the standard laboratory approach
for the recovery of amebic organisms.
(Objective 3-12)
CASE STUDY 3-2
UNDER THE MICROSCOPE
Annie, an 11-year-old white girl, was adopted from a
downtown Chicago orphanage and brought home to her
new family in rural Illinois. Three weeks later, she began to
experience severe diarrhea, fever, malaise, and abdominal
cramping. Examination by her pediatrician led him to order
a stool for culture and parasite examination (commonly
known as an ova and parasite examination [O&P]). The
stool arrived in the laboratory and the gross appearance
was noted as liquid, with mucus and tinges of blood. It was
immediately processed by standard techniques (discussed
in detail in Chapter 2). The culture was negative for intestinal
pathogens.
The direct and concentrated saline wet preps slide
showed suspicious, irregularly shaped forms. The laboratory
technician on duty, suspicious but not certain that a
parasite was present, decided to hold the report pending
further studies. The suspicious form seen in the permanent
stain is shown in the diagram. This form measured 13 µm.
Continued