1: PROTOZOA AMOEBA Flashcards
AMEBAE
- Phylum:
- Subphylum:
Sarcomastigophora, Sarcodina
Equipped with the ability to extend their cytoplasm in the form of __________ (Often referred to as __________), which allows them to move within their environment.
pseudopods, false feet
Two morphologic forms in the amoebic life cycle:
Trophozoites, Cyst
the nonfeeding stage, has a thick
protective cell wall designed to protect the
parasite from the harsh outside
environment when deemed necessary
Cyst
the form that feeds, multiplies, and possesses pseudopods
Trophozoites
The most common means whereby amoebas are transferred to humans is through _____________________________ in contaminated food or water
ingestion of the infective stage cyst
Infective stage of E. histolytica
Mature quadrinucleate cyst
Diagnostic stage of E. histolytica
Trophozoite, cyst
Disease of E. histolytica
Intestinal amebiasis, amebic colitis, amebic dysentery, extraintestinal amebiasis
Ulceration caused by E. histolytica
Flask-shaped ulcer
Most common extraintestinal
complication of amebiasis:
hepatic involvement (Thick chocolate brown
pus/anchovy sauce pus)
CNS involvement of E. histolytica
Secondary Amebic Meningoencephalitis (SAM)
Diagnosis of E. histolytica
Wet preparation, permanent stained smear, culture (TYI-S-33), Serological tests
E. histolytica cyst
- Spherical to round
- Coffin-shaped chromatoid bars
- Central karyosome
- Fine and evenly distributed chromatin
- May contain one to four nuclei
E. histolytica trophozoite
- Rapid, unidirectional, progressive
movement - Single nucleus with small central
karyosome - Presence of ingested RBCs in the
cytoplasm
