Exam II - Phylum Sarcomastigophora Flashcards Preview

RUSVM Parasitology > Exam II - Phylum Sarcomastigophora > Flashcards

Flashcards in Exam II - Phylum Sarcomastigophora Deck (24)
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1
Q

What are the final hosts for Trypanosoma cruzi?

A

dogs, cats, & humans

2
Q

How would you identify Trypanosoma cruzi?

A

trypomastigote in blood smear

trypomastigote in blood smear is elongated, spindle or leaf shaped, 20µm long

3
Q

Which end would be the anterior end?

A

A

4
Q

What is the common name of the condition caused by Trypanosoma cruzi?

A

Chagas’ disease

5
Q

What is/are the site(s) of infection for Trypanosoma cruzi?

A

cardiac & smooth muscle, blood

6
Q

Where for Trypanosoma cruzi amastigotes cause pathogenesis?

A

heart muscle

7
Q

Which animals are most susceptible to Chagas’ disease?

A

puppies & kittens

8
Q

What is the infective stage of Trypanosoma cruzi?

A

trypomastigote

9
Q

Which diagnostic method(s) are used to diagnose Trypanosoma cruzi?

A
  • blood smear
  • xenodiagnosis
10
Q

Describe the treatment options available for Trypanosoma cruzi

A

there is no satisfactory treatment known

11
Q

What form of locomotion do both Giardia & Trypanosoma utilize?

A

pseudopodia and/or flagella

12
Q

What is/are the host(s) for Giardia intestinalis?

A

dogs, cats, cattle

possibly humans?

13
Q

Describe the appearance of Giardia intestinalis trophozoites

A

Trophozoites are 21 um long, teardrop, 2 nuclei, 8 flagella, face-like appearance

14
Q

Describe the appearance of Giardia intestinalis cysts

A

Cysts are 12 um long, ovoid, 4 nuclei

15
Q

Describe the life cycle of Giardia intestinalis

A

Trophozoites adhere to the small intestine and multiply asexually. After several replications, a trophozoite encysts. Cysts pass down the small intestine and are passed in the feces. These are the infective form.

Cysts survive for 2-4 weeks. PPP is 1-2 weeks.

16
Q

What is the infective form of Giardia intestinalis?

A

cyst

17
Q

What is the PPP for Giardia intestinalis?

A

1-2 weeks

18
Q

What is/are the site(s) of infection for Giardia intestinalis?

A

Small intestine

19
Q

Describe any pathogenesis associated with Giardia intestinalis

A

Many infections are asymptomatic. Trophozoites can cause an acute focal inflammation

20
Q

What are some clinical signs associated with Giardia intestinalis?

A

Often none. Acute or chronic diarrhea

21
Q

How would you diagnose Giardia intestinalis?

A

fecal smear will show cysts and/or trophozoites; fecal flotation with zinc sulphate; ELISA

22
Q

What are some treatment & prevention options with Giardia intestinalis?

A

parasiticides (benzimidazoles) and good hygeine. There are, however, no approved treatments in the USA.

23
Q

Describe the appearance of the Trypanosoma cruzi trypomastigote

A

Trypomastigote in blood smear is elongated, spindle or leaf shaped, 20 um long, with nucleus near middle of its length, posterior end pointed

24
Q

How do trypanosomes enter the body?

A

oral, nasal, conjunctival mucosae or by infectious bug feces rubbed into skin abrasions

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