Parasitology 1

Question 1

Excystation

Answer 1

sporozoites are released from sporocysts and eventually from the oocyst

Question 2

Cytostome

Answer 2

mouth

Question 3

Entamoeba histolytica, <4

Answer 3

Dysentery, appendicitis, liver abscess, need permanent stained smear (dark not) (daisy nucleus, slender, chromatoidal bars, RBC inclusion)

Question 4

Entamoeba coli, >4

Answer 4

nonpath (uneven p. chromatin, 8 nuclei, squiggly, debris in cytoplasm)

Question 5

Entamoeba hartmanni

Answer 5

nonpath, no RBC in troph, retain chromosoidal bar in mature cyst unlike E. histolytica (small 2-4 nuclei, target)

Question 6

Endolimax nana, 4

Answer 6

nonpath (fidget spinner, anime eyes, small like hartmanni)

Question 7

Iodamoeba butschlii

Answer 7

Cyst vacuole stained with iodine (vacuoles, basket, nucleus halo) (nana like troph)

Question 8

Balantidium coli, macro/micro

Answer 8

dysentery, only patho ciliate, largest protozoa from swine (cilia, cytostome, vacuoles, macro/micronucleus)

Question 9

Dientamoeba fragilis, 2

Answer 9

Ameboflagellate, no cyst/no wet prep, diarrhea, weight loss, colitis, and eosinophilia (fragmented nucleus, no p. chromatin)

Question 10

Trichomonas vaginalis

Answer 10

wet mount, 10-20 min, may appear like PMN leukocyte (half undulating, long nucleus)

Question 11

Trichomonas hominis

Answer 11

children more likely, small, nonpath (undulating, nucleus at anterior)

Question 12

Trichomonas tenax

Answer 12

teeth, not in stomach or vagina (smaller)

Question 13

Giardia lamblia, flagellate

Answer 13

kids, ventral disks leave impression, diarrhea (owl, spoon, 2-4 nuclei, halo around cyst), traveler’s diarrhea

Question 14

Chilomastix mesnili

Answer 14

nonpath, cecal region in intestine (shepards crook, tail, lemon shape)

Question 15

Trypanosoma cruzi

Answer 15

chagas disease (C or U, big dot)

Question 16

Trypanosoma gambiense W

Answer 16

tsetse fly, dividing form seen (longer, small dot)

Question 17

Trypanosoma rhodesiense E

Answer 17

more severe, dividing form seen

Question 18

Leishmania tropica

Answer 18

sandfly, cutaneous lesion (in macrophage, kinetoplast)

Question 19

Pneumocystis carinii

Answer 19

Pneumonia in immuno, fungus (grouped in sputum)

Question 20

Cryptosporidium parvuum

Answer 20

Oocyst

Question 21

Toxoplasma gondii

Answer 21

little fish swimming with 1 big nucleus

Question 22

Babesia

Answer 22

ticks, in RBC, tetrad, purple dot in fingernail, diamond ring