Parasites - Intestinal Protozoa

Question 1

Entamoeba histolytica infectious stage

Answer 1

Mature cysts ingested

Question 2

Entamoeba histolytica diagnostic stage

Answer 2

Trophozoite and cysts in feces

Question 3

Entamoeba histolytica info

Answer 3

pathogenic
associated with intestinal and extra intestinal infections
ingestion of RBCs

Question 4

Entamoeba histolytica classification

Answer 4

Intestinal amoeba

Question 5

Entamoeba bangladeshi info

Answer 5

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

Question 6

Endolimax nana info

Answer 6

troph - single nucleus, irregular shape, large karyosome

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

Question 7

Iodamoeba buetschlii info

Answer 7

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

Question 8

Blastocystis hominis info

Answer 8

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

Question 9

Balantidium coli infectious stage

Answer 9

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

Question 10

Balantidium coli diagnostic stage

Answer 10

Cyst in feces

Question 11

Balantidium coli info

Answer 11

pathogenic
swine are animal reservoir
bean shaped macronucleus

Question 12

Balantidium coli classification

Answer 12

Ciliate

Question 13

Giardia lamblia infectious stage

Answer 13

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

Question 14

Giardia lamblia diagnostic stage

Answer 14

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

Question 15

Giardia lamblia info

Answer 15

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

Question 16

Giardia lamblia classification

Answer 16

Intestinal flagellate - pathogenic

Question 17

Dientamoeba fragilis infectious stage

Answer 17

trophozoites ingested

Question 18

Dientamoeba fragilis diagnostic stage

Answer 18

trophozoites in feces

Question 19

Dientamoeba fragilis info

Answer 19

asymmetrical ameboid form
80% contain 2 nuclei
pseudopods for motility

Question 20

Dientamoeba fragilis classification

Answer 20

intestinal flagellate - pathogenic

Question 21

Chilomastix mesnili infectious stage

Answer 21

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

Question 22

Chilomastix mesnili diagnostic stage

Answer 22

Trophozoite in feces

Question 23

Chilomastix mesnili info

Answer 23

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

Question 24

Chilomastix mesnili classification

Answer 24

Intestinal flagellate - nonpathogenic

Question 25

Pentatrichomonas hominis infectious stage

Answer 25

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

Question 26

Pentatrichomonas hominis diagnostic stage

Answer 26

Trophozoite in feces

Question 27

Pentatrichomonas hominis info

Answer 27

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

Question 28

Pentatrichomonas hominis classification

Answer 28

Intestinal flagellate - nonpathogenic

Question 29

Cryptosporidium infectious stage

Answer 29

Thick walled oocyst ingested by host

Question 30

Cryptosporidium diagnostic stage

Answer 30

Thick walled oocyst (sporulated) exits host

Question 31

Cryptosporidium info

Answer 31

small intestine most common site

Question 32

Cryptosporidium classification

Answer 32

Coccidia

Question 33

Cyclospora cayetanensis infectious stage

Answer 33

Ingestion of contaminated food/water

Question 34

Cyclospora cayetanensis diagnostic stage

Answer 34

Excretion of unsporulated oocysts in stool

Question 35

Cyclospora cayetanensis classification

Answer 35

Coccidia

Question 36

Cystoisospora belli infectious stage

Answer 36

Mature oocysts with sporozoites

Question 37

Cystoisospora belli diagnostic stage

Answer 37

Oocysts in feces

Question 38

Cystoisospora belli info

Answer 38

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

Question 39

Cyclospora cayetanensis info

Answer 39

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