Parasite Amoeba identification Flashcards Preview

Med Lab Tech Fall 2016 > Parasite Amoeba identification > Flashcards

Flashcards in Parasite Amoeba identification Deck (19):
1

› 10 - 20 um

› presence of ingested RBCs is diagnostic

Entamoeba histolytica troph

2

› 10 - 20 um

› presence of ingested RBCs is diagnostic

Entamoeba histolytica troph

3

› 10 - 20 um

› 1 - 4 nuclei

› rounded chromatoid bodies

Entamoeba histolytica cyst

4

›5-10 micrometers

›finger shaped pseudopods with nonprogressive movement

›1 nuclei

›peripheral chromatin is beaded

›Karyosome is centrally or eccentrically located

Entamoeba hartmanni trophozoite

5

›5-10 micrometers

›1-4 nuclei

›cytoplasm is finely granular

Entamoeba hartmanni cyst

6

›5-10 micrometers

›finger shaped pseudopods with nonprogressive movement

›1 nuclei

›peripheral chromatin is beaded

›Karyosome is centrally or eccentrically located

Entamoeba hartmanni troph

7

›5-10 micrometers

›1-4 nuclei

›cytoplasm is finely granular

Entamoeba hartmanni cyst

8

›15 - 50 um

› ingested bacteria

Entamoeba coli troph

9

›  10 - 35 um

›  1 - 8 nuclei

›  splinter-shaped chromatoid bodies

Entamoeba coli cyst

10

Entamoeba coli cyst & troph

11

›6-12 micrometers

›Large irregular “blot Like” karyosome

›Absence of peripheral chromatin

Endolimax nana troph

12

›7-10 micrometers

›spherical, ovoid or elliptical

›4 nuclei is most common form

›no peripheral chromatin

›no chromatoid bars

Endolimax nana cyst

13

› Commensal

› Found in pigs as well as in humans

› Nucleus

› large, irregular shape

› lacks peripheral chromatin

Iodamoeba butschlii

14

›Only ameba with 3 forms

›Ameboid trophozoite

› Flagellate trophozoite

› Cyst

›Lab Id- microscopic exam of CSF is the method of choice

›tissue of nasal discharge can also be used

NO CYST STAGE IN HUMANS

Naegleria fowleri

15

› Nucleus

› large karyosome

› lacks peripheral chromatin

› Trophozoite

› 7 - 20 um

› seen in purulent CSF

Naegleria fowleri

16

› Free-living stage found in water, soil, and decaying vegetation

› opportunistic parasite

› enters through nasal mucosa or skin

› patient usually immunocompromised

› poor contact lens care

› swimming in ponds while wearing lenses

Acanthamoeba species

17

› 5- 30 um

› homogeneous-staining central body

› occupies ~ 70% of cell

›nuclear material between central body and outer membrane

›No known cyst stage

Blastocystis hominis

18

›The only ciliate known to be a human pathogen

›Hogs are the true host; humans serve as accidental hosts

›Most infections are asymptomatic but may cause self-limiting diarrhea

›Balantidium coli

19

›8-10 micrometers

›Glycogen mass with definite borders

Iodamoeba butschlii cyst