Studied by 2 people
Entamoeba
has a spherical nucleus with a distinct nuclear membrane lined with chromatin granules and a small karyosome found in the center of the nucleus
1
Troph of Entamoeba usually only have how many nuclei?
Endolimax
has a vesicular nucleus with a relatively large and irregularly shaped karyosome anochored to the nucleus by achromatic fibrils
Iodamoeba
characterized by a large, chromatin-rich karyosome surrounded by a layer of achromatic globules and anchored to the nuclear membrane by achromatic fibrils
Entamoeba gingivalis
Has no cyst stage and does not inhabit the intestines
Cyst walls
protect cysts from gastric acid
Excystation
occur in an alkaline environment of the lower small intestines
Metacystic trophozoites
colonize the large intestines and live on the mucus coat covering the intestinal mucosa
Binary fission
How trophozoites reproduce
Encystation
occurs as amebae pass through the lower colon where colonic contents are more dehydrated
Commensal amoebae
Amoebae that are non-invasive and do not cause disease
Entamoeba hartmanii
Similar to E. histolytica but is much smaller and does not ingest RBCs
Quadrinucleated and have a coarse cytoplasm
Mature cysts of E. hartmanii
Chromotoidal bars that are bar-like
Immature cysts of E. hartmanii
Colon
Where can Entamoeba coli be found?
Large eccentric karyosome
Karyosome characteristic of Entamoeba coli trophozoite
with bacteria (dirty-looking)
Endoplasm of Entamoeba coli trophozoite
8
How much nuclei does Entamoeba coli cyst have?
Splinter-like
Chromotoidal bodies of Entamoeba coli cyst
Entamoeba polecki
parasite of pigs and monkeys
1
How many nuclei does Entamoeba polecki cyst have?
Entamoeba gingivalis
Amoeba that live on the teeth and gum
Kissing Droplet spray Sharing of utensils
How can E. gingivalis be transmitted?
Endolimax nana
smallest intestinal amoebae
Blot-like karyosome
Nucleus of Endolimax
Has 4 nuclei, cross-eyed
Mature cysts of Endolimax
Achromatic granules
Iodamoeba butschlii trophozoite characteristic
Large glycogen body which stains deeply with iodine
Iodamoeba butschlii cyst characteristic
Trophozoites
What can be seen in liquid or semi-formed stools?
Cyst
What can be seen in formed stools?
Direct fecal smear
Diagnostic test that best demonstrates trophozoites
Formalin Ether Concentration Technique Zinc sulfate flotation technique
2 concentration techniques used for cysts
Iodine stain
Stain used to differentiate amoeba species
Swab
What specimen is used against the teeth and gums to detect E. gingivalis?
