What is the cause of Blackhead in turkey?
In which poultry populations is Histomonas meleagridis the most prevalent?
Breeder and layer flocks
True or False:
Histomonas meleagridis exits in both the trophozoite and cyst stages.
What are the modes of transmission for the trophozoite of Histomonas meleagridis?
From contaminated bedding with fresh feces (cloacal drinking)
What is the primary mode of transmission for Histomonas meleagridis?
Heterakis (the cecal worm)
Explain the life cycle of Histomonas meleagridis.
Trophozoites localize in lumen of ceca
Invade cecal wall
Extend to liver via venous blood
Which lesions are pathognomonic for Histomonas meleagridis?
Liver lesions (circular concave foci of various colors and sizes)
In which population of cattle is Tritrichomonas foetus more common?
Which two stages does Tritrichomonas foetus go through?
How is Tritrichomonas foetus transmitted?
- Mechanically during coitus
- Iatrogenic during AI
Concerning Tritrichomonas foetus:
- Cows become infertile for ___ to ___ months.
- Cows develop a short term immunity and regain fertility in ___ to ___ months.
- 2-6 months
- 1-4 months
What are the other differentials for Tritrichomonas foetus?
Campylobacter fetus subspecies veneralis
What might you sample in a cow suspected of a Tritrichomonas foetus infection?
Uterine discharge (pyometra)
What might you sample in a fetus with a dam suspected of Tritrichomonas foetus?
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
Which 2 diseases does Trichomonas gallinae cause in poultry?
Which stages are there within the life cycle of Trichomonas gallinae?
NO CYST STAGE
How is Trichomonas gallinae transmitted?
Oral-oral transmission of trophozoites :
Adult to young via crop milk
Adult to adult during courtship
What is the infective stage of Trichomonas gallinae?
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
Tritrichomonas blagburni infects which species?
In which environments is Tritrichomonas blagburni most prevalent?
(Usually less than 1 year old)
How is spread of Tritrichomonas blagburni believed to occur?
Direct contact from cat to cat
What is the cause of Trichomoniasis in humans?
Which Apicomplexan has the simplest life cycle?
What is the disease called caused by an Eimeria infection?