U4.4 - Protozoans (Blastocystis hominis)

Question 1

T/F:
Blastocystis hominis is currently a commensal of the GI tract

Answer 1

True

Question 2

Blastocystis hominis:
Classified member of?

Answer 2

Stramenopiles

Question 3

Blastocystis hominis:
Suggested new class:

Answer 3

Class Blastocystea

Question 4

Blastocystis hominis:
Previously classified as a yeast in?

Answer 4

Schizosaccharomyces

Question 5

Blastocystis hominis:
previously associated with?

Answer 5

Blastomyces

Question 6

Blastocystis hominis:
MOT

Answer 6

ingestion of thick walled cysts

Question 7

T/F:
Blastocystis hominis’ life cycle is not fully understood.

Answer 7

True

Question 8

Blastocystis hominis:
morphologic form that is most predominant

Answer 8

Classic Vacuolated Form
(Central-Body Form)

Question 9

Blastocystic hominis:
Granular forms

Answer 9

multinucleated

Question 10

Blastocystic hominis:
vacuolar forms

Answer 10

1. multivacuolar
2. avacuolar

Question 11

Blastocystic hominis:
Ameboid form

Answer 11

exhibit active extension and retraction of pseudopodia

Question 12

Blastocystic hominis:
Nuclear chromatin
exhibits?

Answer 12

peripheral clumping

Question 13

Blastocystic hominis:
Intermediate stage
between vacuolar and
precystic form

Answer 13

Ameboid form

Question 14

Identify the parasite and diagnostic stage:
has a thick, osmophilic, and electron dense cystic wall

Answer 14

Blastocystic hominis cyst

Question 15

Blastocystic hominis:
Disease Manifestation

Answer 15

1. Blastocytosis
2. Pathology is still in question and controversial
3. Diarrhea, nausea, anorexia
4. May also be associated with irritable bowel syndrome

Question 16

Blastocystic hominis:
Epidemiology

Answer 16

1. Occurs worldwide
2. Zoonotic
3. Most common subtype infecting man is subtype 3

Question 17

Blastocystic hominis:
lab diagnosis

Answer 17

1. DFS
2. FECT
3. Molecular methods
4. Stains

Question 18

Blastocystic hominis:
culture

Answer 18

Boeck and Drborhlav

Question 19

Blastocystic hominis:
treatment

Answer 19

1. Still controversial
2. Usually use metronidazole