Flagellates 3 Flashcards Preview

Parasitology 376 > Flagellates 3 > Flashcards

Flashcards in Flagellates 3 Deck (28):
1

What is the cause of Blackhead in turkey?

Histomonas meleagridis

2

In which poultry populations is Histomonas meleagridis the most prevalent?

Breeder and layer flocks

3

True or False:

Histomonas meleagridis exits in both the trophozoite and cyst stages.

FALSE

NO cyst!!!

4

What are the modes of transmission for the trophozoite of Histomonas meleagridis?

From contaminated bedding with fresh feces (cloacal drinking)

Paratenic hosts

5

What is the primary mode of transmission for Histomonas meleagridis?

Heterakis (the cecal worm)

6

Explain the life cycle of Histomonas meleagridis.

Trophozoites localize in lumen of ceca

Invade cecal wall

Extend to liver via venous blood

Multiply asexually

 

7

Which lesions are pathognomonic for Histomonas meleagridis?

Liver lesions (circular concave foci of various colors and sizes)

8

In which population of cattle is Tritrichomonas foetus more common?

Older bulls

9

Which two stages does Tritrichomonas foetus go through?

Trophozoite

Pseudocyst

10

How is Tritrichomonas foetus transmitted?

Venereally:

  1. Mechanically during coitus
  2. Iatrogenic during AI

11

Concerning Tritrichomonas foetus:

  1. Cows become infertile for ___ to ___ months.
  2. Cows develop a short term immunity and regain fertility in ___ to ___ months.

  1. 2-6 months
  2. 1-4 months

12

What are the other differentials for Tritrichomonas foetus?

Vibriosis

Leptospirosis

Brucellosis 

Campylobacter fetus subspecies veneralis

13

What might you sample in a cow suspected of a Tritrichomonas foetus infection?

Cervico-vaginal mucus

Uterine discharge (pyometra)

14

What might you sample in a fetus with a dam suspected of Tritrichomonas foetus?

Abomasal contents

Placental fluids

15

When taking samples to check for a Tritrichomonas foetus infection, you want to avoid contamination of the sample with feces.  What else should you avoid?

Contamination with blood

16

Which 2 diseases does Trichomonas gallinae cause in poultry?

Canker

&

Frounce

17

Which stages are there within the life cycle of Trichomonas gallinae?

Trophozoite

NO CYST STAGE

18

How is Trichomonas gallinae transmitted?

Oral-oral transmission of trophozoites :

Adult to young via crop milk

Adult to adult during courtship

Contaminated water

19

What is the infective stage of Trichomonas gallinae?

Trophozoites

20

You see the following lesions; what organism do you suspect is involved?

Raised accumulations of caseous yellow to white exudate plaques present on mucosal surfaces of the mouth, crop, and sinuses

21

Tritrichomonas blagburni infects which species?

Feline

22

In which environments is Tritrichomonas blagburni most prevalent?

Shelters

Cat colonies

Multi-cat households

(Usually less than 1 year old)

23

How is spread of Tritrichomonas blagburni believed to occur?

Direct contact from cat to cat

24

What is the cause of Trichomoniasis in humans?

Trichomonas vaginalis

25

Which Apicomplexan has the simplest life cycle?

Eimeria

26

What is the disease called caused by an Eimeria infection?

Coccidiosis

27

  1. Eimeria is an obligate intracellular parasite, usually in which type of cells?
  2. In what other tissues might they house themselves?

  1. Gut epithelial cells
  2. Lacteal endothelium, kidneys, bile duct

28