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PH 172 > Schistosoma > Flashcards

Schistosoma Flashcards

0
Q 
False about Schistosomiasis
A. Wide range of definitive hosts
B. May become a Neglected Tropical Disease
C. Migrate in chemical gradients
D. All are true
A

C

thermal dapat

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1
Q 
Which type of climate is suitable for first IM host?
A. Polar
B. Temperate
C. Tropical
D. Any of the 3
A

C

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2
Q

Only country successful in eliminating schistosomiasis

A

Japan

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3
Q 
Schistosoma species most common in Philippines
A. S.japonicum
B. S.haematobiun
C. S.mansoni
D. The three are equally common
A

A

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4
Q 
Schistosoma species most common in Africa & the Middle East
A. S.japonicum
B. S.haematobiun
C. S.mansoni
D. The three are equally common
A

B

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5
Q 
Schistosoma species most common in South America
A. S.japonicum
B. S.haematobiun
C. S.mansoni
D. The three are equally common
A

C

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6
Q

Top 1 province in number of Schisto cases

A

Oriental Mindoro

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7
Q

Top 2 province in number of Schisto cases

A

Agusan del Sur

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8
Q

Gynecophoric canal is found in __ Schistosoma species
A. Male
B. Female
C. Hermaphroditic

A

A

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9
Q

Which is true?
A. Schistosoma species are not hermaphroditic.
B. Schistosoma females will not reach sexual maturity without the male.
C. Schistosoma does not have a metacercaria stage.
D. A and B
E. A, B and C

A

E

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10
Q

In feces, Schisto eggs are __
A. Unfertilized
B. Fertilized
C. Embryonated

A

C

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11
Q

When do the Schistosoma eggs hatch into miracidia?
A. When they are excreted in feces
B. When they reach the water
C. When they are ingested by the first IM host
D. When they are ingested by humans

A

B

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12
Q

First intermediate host of Schisto is a snail. What is the snail’s genus?

A

Oncomelania

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13
Q

What makes Schisto worms so attracted to Oncomelania?

A

Oncomelania secretes chemicals that attract and guide the larvae. Also other snails have strong immune response against them.

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14
Q 
Which is not a devt stage of Schisto?
A. Mother sporocyst
B. Daughter sporocyst
C. Rediae
D. Cercariae
A

C

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15
Q

Schistosoma infective stage

A

Cercariae

16
Q

Free swimming Schistocercariae enter the definitive host via __

A

Skin penetration

17
Q

Which kind of gradient guides Schisto to its definitive hosts?

A

Thermal gradient

18
Q

When they enter their definitive host, Schisto cercaria lose their tail and become __ and migrate to portal blood in liver.

A

Schistosomulae

19
Q

True or false.

The burden of the disease depends on the intensity of the infection.

A

True

20
Q

As the eggs undergo embryonation, more and more antigens are produced. The antigens are released through the ___

A

Egg pores

21
Q 
Which is false?
A. The antigens released by  Schisto will attract lymphocytes and cytokines
B. No granulomas will be formed
C. Type IV hypersensitivity is at work
D. All are true
A

B

22
Q

What is formed once granulomas and other substances are attracted to the liver due to the lymphokines and cytokines?

A

Pipe-stem hepatic fibrosis

23
Q

Because of pipe-stem hepatic fibrosis, blood cannot pass through the vessels in the liver to the heart. What essels are formed because of this?

A

Collateral vessels

24
Q

False abt caput medusae
A. Formed collateral vessel
B. Happens in severe schistosomiasis
C. Surgery is not yet needed

A

C

25
Q

Systemic edema is also called __

A

Ascites

26
Q

Which does not happen when granuloma is not modulated?
A. Reduced production of fertile eggs
B. Inhibition of egg maturation
C. Accelerated destruction of miracidium
D. Increased T-cell responsiveness to egg antigen

A

D

27
Q 
Which type of Schistosomiasis happens due to schistosomular migration?
A. Early
B. Colonic
C. Hepatosplenic
D. Pulmonary
A

A

28
Q 
Which type of Schistosomiasis happens due to schistosomular migration?
A. Early
B. Colonic
C. Hepatosplenic
D. Pulmonary
A

B

29
Q 
Which type of Schistosomiasis is the most serious consequence of chronic schistosomiasis?
A. Early
B. Colonic
C. Hepatosplenic
D. Pulmonary
A

C

30
Q

The Schistosoma worm may affect the lungs via cor pulmonale. What is cor pulmonale?

A

Obstruction of pulmonary vasculature caused by granuloma formation and subsequent fibrosis

31
Q

Drug of choice for schistosomiasis

A

Praziquantel

32
Q 
Which is not used to diagnose Schisto?
A. Kato Katz
B. X-ray
C. ultrasonography in liver
D. Rectal biopsy
A

B

PH 172 (25 decks)

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