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Microbiology > Parasites - Intestinal Protozoa > Flashcards

Parasites - Intestinal Protozoa Flashcards

1
Q

Entamoeba histolytica infectious stage

A

Mature cysts ingested

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2
Q

Entamoeba histolytica diagnostic stage

A

Trophozoite and cysts in feces

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3
Q

Entamoeba histolytica info

A

pathogenic
associated with intestinal and extra intestinal infections
ingestion of RBCs

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4
Q

Entamoeba histolytica classification

A

Intestinal amoeba

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5
Q

Entamoeba bangladeshi info

A

can only differ from histo/dispar by a small subunit rRNA gene sequence

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6
Q

Endolimax nana info

A

troph - single nucleus, irregular shape, large karyosome

cysts - 4 nuclei, large karyosome with no peripheral chromatin, cytoplasm may contain glycogen

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7
Q

Iodamoeba buetschlii info

A

troph - single nucleus, large central karyosome, refractive achromatic granules
cysts - single nucleus, large eccentric karyosome, large glycogen vacuole

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8
Q

Blastocystis hominis info

A

only grows in presence of bacteria
ingests bacteria
central body vacuole 70% of cell
up to 6 nuclei

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9
Q

Balantidium coli infectious stage

A

Cyst - acquired by the host through ingestion of contaminated food or water

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10
Q

Balantidium coli diagnostic stage

A

Cyst in feces

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11
Q

Balantidium coli info

A

pathogenic
swine are animal reservoir
bean shaped macronucleus

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12
Q

Balantidium coli classification

A

Ciliate

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13
Q

Giardia lamblia infectious stage

A

Contamination of water, food, or hands/fomites with infective cysts

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14
Q

Giardia lamblia diagnostic stage

A

Trophozoites are also passed in stool but do not survive in environment

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15
Q

Giardia lamblia info

A

bilateral symmetry - sucking disks, 2 median paranasal bodies associated with flagella, central axostyle central attachment of flagella
falling leaf motility

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16
Q

Giardia lamblia classification

A

Intestinal flagellate - pathogenic

17
Q

Dientamoeba fragilis infectious stage

A

trophozoites ingested

18
Q

Dientamoeba fragilis diagnostic stage

A

trophozoites in feces

19
Q

Dientamoeba fragilis info

A

asymmetrical ameboid form
80% contain 2 nuclei
pseudopods for motility

20
Q

Dientamoeba fragilis classification

A

intestinal flagellate - pathogenic

21
Q

Chilomastix mesnili infectious stage

A

Contamination of water, food, or hands/fomites with infective cysts

22
Q

Chilomastix mesnili diagnostic stage

A

Trophozoite in feces

23
Q

Chilomastix mesnili info

A

pear shaped troph
single large nucleus below outer membrane
lemon drop shaped cyst
distinct hyaline knob

24
Q

Chilomastix mesnili classification

A

Intestinal flagellate - nonpathogenic

25
Q

Pentatrichomonas hominis infectious stage

A

Contamination of water, food, or hands/fomites with infective cysts

26
Q

Pentatrichomonas hominis diagnostic stage

A

Trophozoite in feces

27
Q

Pentatrichomonas hominis info

A

teardrop shaped troph
single nucleus displaced from outer membrane
undulating membrane full length of organism

28
Q

Pentatrichomonas hominis classification

A

Intestinal flagellate - nonpathogenic

29
Q

Cryptosporidium infectious stage

A

Thick walled oocyst ingested by host

30
Q

Cryptosporidium diagnostic stage

A

Thick walled oocyst (sporulated) exits host

31
Q

Cryptosporidium info

A

small intestine most common site

32
Q

Cryptosporidium classification

A

Coccidia

33
Q

Cyclospora cayetanensis infectious stage

A

Ingestion of contaminated food/water

34
Q

Cyclospora cayetanensis diagnostic stage

A

Excretion of unsporulated oocysts in stool

35
Q

Cyclospora cayetanensis classification

A

Coccidia

36
Q

Cystoisospora belli infectious stage

A

Mature oocysts with sporozoites

37
Q

Cystoisospora belli diagnostic stage

A

Oocysts in feces

38
Q

Cystoisospora belli info

A 
pathogenic
eosinophilia may be present
ellipsoidal shape oocyst
matures after excretion
single sporoblast divides into 2 sporocysts
39
Q

Cyclospora cayetanensis info

A

sporulation is temp dependent taking several weeks for an infective oocyst to contain 2 sporocysts

Microbiology (37 decks)

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