Micro 6 Parasites

Question 1

Protozoa associated with water contamination outbreak

Answer 1

Cryptosporidium parvum

Question 2

Entamoeba histolytica lifecycle

Answer 2

Trophozites replicate in intestine, encystation in colon, reingestion, excystation in gastric acid

Question 3

Entamoeba histolytica pathology

Answer 3

• Afebrile dysentery (blood) or watery diarrhea
• Abscess in liver or brain
• Ulcer

Question 4

Amebiasis risk

Answer 4

Poor sewage countries

Question 5

E. histolytica Dx

Answer 5

• Microscopy of stools
• Serology
• CT for abscess

Question 6

E. histolytica appearance

Answer 6

Gooey or cyst

Question 7

Amebiasis ddx

Answer 7

MUCUS and blood in stool
No granulocytosis
No fever

Question 8

Tx for all parasites

Answer 8

• Metronidazole for E. histolytica & G. lamblia

- Nitazoxanide for C. parvum

Question 9

Giardia lamblia lifecycle

Answer 9

Same as ameba

Question 10

Giardia lamblia risk

Answer 10

Beavers and Dogs

Question 11

Giardia lamblia appearance

Answer 11

Ghost or cyst

Question 12

Giardiasis ddx

Answer 12

• Watery diarrhea (no mucus, blood, PMN, fever)

- Flatulence, stinky greasy stools (malabsorption), lactose intolerance

Question 13

Giardiasis Dx

Answer 13

ELISA antigen test, stool microscopy

Question 14

Cryptosporidium parvum lifecycle

Answer 14

Same

Question 15

Cryptosporidium parvum risk

Answer 15

Cows, anal sex, AIDS

-Chlorine resistant

Question 16

Cryptosporidium Dx

Answer 16

ELISA, fluorescent microscopy

Question 17

Roundworm name, location, & path

Answer 17

• Ascaris lumbricoides
• Small intestine
• Intestinal obstruction

Question 18

Hookworm name, location, & path

Answer 18

• Ancylostoma duodenale, Necator americanus
• Small intestine
• Anemia

Question 19

Threadworm name, location, & path

Answer 19

• Strongyloides stercoralis
• Small intestine
• Anaphylactic shock (autoinfection)

Question 20

Whipworm name, location, & path

Answer 20

• Trichuris trichiura
• Colon
• Anal prolapse

Question 21

Fish tape worm name, location, & path

Answer 21

• Diphyllobothrium latum
• Small intestine
• Macrocytic anemia (B12)

Question 22

Worms that enter through skin

Answer 22

• Hookworm (ancylostoma & necator)

- Threadworm (strongyloides)

Question 23

Ascaris egg

Answer 23

Corticated & pigmented (thick and dark)

Question 24

Ascaris lumbricoides outside of intestine

Answer 24

Lung lifecycle

Question 25

Ancylostoma egg

Answer 25

Thin-walled multi-cell (looks wet)

Question 26

Ancylostoma outside of intestine

Answer 26

- Lungs | - Chew out, suck blood

Question 27

Strongyloides egg

Answer 27

Look for larvae instead

Question 28

Storngyloides outside the intestine

Answer 28

Filariform larvae thread back into skin, follow lung lifecycle, turn into Rhabditiform larvae

Question 29

Trichuris egg

Answer 29

Thick-walled oval with polar hyaline plug

Question 30

Trichuris outside the intestine

Answer 30

Whip out the prolapse

Question 31

Cysticercosis tape worm

Answer 31

Taenia solium (pork)

Question 32

Broad/Fish tape worm

Answer 32

- Diphyllobothrium latum - B12 deficiency - Scolex bites your shit