L23 - CONDENSED

Question 1

Which of the following has a trophozoite form that, while NOT infective, IS found in the colon and invades by eating RBC’s and releasing proteases?
A. G. lamblia
B. T. vaginalis
C. E. histolytica
D. N. fowleri

Answer 1

C. E. histolytica

Question 2

Which form of E. histolytica allows for transmission/infection of new host and forms with feces formation?
A. Cyst form
B. Trophozoite form

Answer 2

A. Cyst form

Question 3

Which flagellate is the most common cause of waterborn diarrhea outbreaks + humans are the man reservoir?
A. T. vaginalis
B. G. lamblia

Answer 3

B. G. lamblia

Question 4

True or False: The cyst form of E. histolytica and G. lamblia are the forms responsible for transmission

Answer 4

True

Question 5

Which flagellate has a cyst form that is formed as trophs dehydrate?
A. T. vaginalis
B. G. lamblia

Answer 5

B. G. lamblia

Question 6

Which flagellate has x4 flagella, an adhesion disc, and have villi that display a Lawnmower Effect?
A. E. histolytica
B. C. parvum
C. G. lamblia

Answer 6

C. G. lamblia

Question 7

Which of the following is associated with brain necrosis and a trophozite form that becomes flagellated under adverse conditions?
A. T. vaginalis
B. N. fowleri
C. C. parvum
D. E. histolytica

Answer 7

B. N. fowleri

Question 8

True or False: C. parvum has a cyst form that is environmentally resistane and a trophozoite form that becomes flagellated under adverse conditions

Answer 8

False - this is the case with N. fowleri

Question 9

Promitosis (replication via bin fission, with nuclear membrane remaining in tact) is seen in….

Answer 9

N. fowleri

Question 10

Keratitis can be seen with ______
A. T. vaginalis
B. Acanthamoeba
C. N. folwleri

Answer 10

B. Acanthamoeba

Question 11

True or False: T. vaginalis is the one protozoan known to be transmitted via sexual contact

Answer 11

True

Question 12

True or False: Patients with E. histolytica and G. lamblia can be asymptomatic

Answer 12

True

Question 13

Dysentery, Abscess of Liver/Brain/ALA, and Ameboma are seen with infection by….
A. E. histolytica
B. C. parvum
C. T. vaginalis

Answer 13

A. E. histolytica

Question 14

Epithelial erosion and interference with fat/protein absorption are seen with infection by….

Answer 14

G. lamblia

Question 15

How does G. lamblia attach to microvilli?

Answer 15

Sucking disks

Question 16

Which microbe causes malaria and toxoplasmosis?

Answer 16

C. parvum

Question 17

Sporozoite are release from oocyte, attach to microvilli, and become meronts with infection by which microbe?

Answer 17

C. parvum

Question 18

Acid-Fast staining or H&E is best for examining which microbe?

Answer 18

C. parvum

Question 19

True or False: C. parvum is an obligate intracellular parasite

Answer 19

True

Question 20

Which stage of the N. fowleri life cycle is the infective one?

A. Cyst
B. Ameboid Trophozoite C. Flagellated

Answer 20

B. Ameboid Trophozoite

Question 21

True or False: T. vaginalis prefers an acidic environment

Answer 21

False - basic

Question 22

True or False: G. lamblia does invade

Answer 22

False - it does NOT

Question 23

A patient has Statorrhea (excess fat in stool) that you identify via: Direct Fecal Sudan Stain. Which microbe likely infected them?

Answer 23

G. lamblia

Question 24

C. parvum has sporozoite that become meronts. Following this, they parasitize the ____ and ___

Answer 24

GI; respiratory tract

Question 25

Once C. parvum is inside epithelial cell, it goes through sporogony ( ) and merogony ( )

Answer 25

sporogonoy = sexual
mergony = asexual

Question 26

In C. parvum, oocysts are a result of sexual reproduction. In ____ walled oocysts, there is ____. In ____ walled oocysts, oocysts shed in stool.

Answer 26

Autoinfect
- thin walled

Oocysts shed in stool
- thick walled

Question 27

E. histolytica is transmitted via ___ contamination of food and water, whereas G. lamblia is food borne, and C. parvum is person-person, domestic animals, or fecal-oral

Answer 27

fecal