Chapter 3: The Amebas Flashcards
True or False: Amebas transform from trophozoites to cysts on entry into an unsuspecting human.
False
Formed stool specimens are more likely to contain which of the following?
Cysts
Infections with intestinal amebas are prevalent in which of the country?
Underdeveloped countries with poor sanitary conditions
What structures is (are) typical in trophozoites of E. histolytica?
Single nucleus with a small karyosome
E. histolytica infection is traditionally diagnosed by finding?
Trophozoites and/or cysts in a suspected stool sample
What is the infective stage of E. histolytica?
Cyst
What factor is not responsible for the asymptomatic carrier state of a patient infected with E. histolytica?
Patient’s blood type
Which of the following prevention measures can control the spread of E. histolytica?
Boiling water or treat with iodine crystals
What is the main difference between the trophozoites of E. hartmanni and E. histolytica?
Trophozoites of E. hartmanni do not contain ingested red blood cells
True or False: The organism E. hartmanni is found worldwide.
True
What trophozoites does have a typical nucleus consists of a large, often irregularly shaped karyosome that is eccentrically located?
Trophozoites of E. coli
True or False: E.coli is considered to be a pathogen.
False
True or False: Cysts of E. polecki contain at least four nuclei
False
Infection with E. polecki is mainly transmitted to humans via?
Ingestion of E. polecki cysts
What is usually the appearance of an E. nana karyosome?
Blotlike
True or False: E. nana is prevalent in areas in which poor hygiene and substandard sanitary conditions exist.
True
Iodamoeba bütschlii cysts typically:
Lack chromatid bars
Transmission of I. bütschlii occurs when:
The infective cysts are ingested in contaminated food or drink
It is a unique characteristics of E. gingivalis.
E. gingivalis is the only ameba that may ingest white blood cells
What ameba is can be found in the mouth and in the genital tract?
Entamoeba gingivalis
Ameboid trophozoites, flagellate forms, and cysts, what amebas morpholigic form it is?
Naegleria fowleri
The specimen of choice for the recovery of N. fowleri is?
Cerebrospinal fluid
Humans most often contract N. fowleri by _____?
Swimming in contaminated water
The ameboid trophozoites of N. fowleri enter the human body through all of the following routes except:
Ingesting contaminated food and drink
Providing education and awareness in the medical community, is practical measures for the control and prevention of what ameba?
Naegleria fowleri
The term acanthropoda refers to:
Spinelike pseudopods
The specimen of choice for diagnosing Acanthamoeba species trophozoites and cysts is ____?
Cerebrospinal fluid
Human may acquire this ameba by aspiration or nasal inhalation of the organisms and by swimming or bathing in contaminated water, what ameba is this?
Acanthamoeba species
Infections with Acanthamoeba species are encountered in ____?
Eye
To prevention infection with Acanthamoeba species, contact lens wearers should avoid ____?
Using homemade nonsterile saline solutions
