PQ 1 Flashcards
What is the location of Histomonas meleagridis?
digestive tract, liver and cecum
Cryptosporidium- where does sporogony occur (options: inside/outside host)?
inside
What is the size of the oocyst of Cryptosporidium?
4 - 6um
Life cycle of Cryptosporidium?
Schizogony:
- Host ingest oocyst, woth 4 sporozoites.
- Sporozoites released in small intestine
- Attach (not penetrate) to microvilli.
- Multiply and form schizont -> division -> 8 merozoites
- One more round of schizogony.
Gametogony:
- Formation of micro and macrogamonts
- Gamestocyst form and fuse -> zygote
Sporogony:
- 2 types of oocyst are formed
- 80% develop into thick walled. Pass to the environment with feces.
- 20% develop into thin- walled oocyst and release their sporozoites in the
intestine representing the autoinfective life cycle form.
Life cycle of Sarcocystis
Schizogony: Intermediat host
- Ingestion and excystation of oocyte in GIT (isospora type)
- Penetrate to blood – sporocyte -> meront -> merozoite
- 1 st generations – artery eoithelium, 2 nd gen. capillary ep., 3 rd gen in circulating
lymphocytes
- Striated mucles – enclosed in cysts
- Merozoite -> metrozoite -> bradyzoites - infective
Gametogony: Final host
- Sarcocyst – bradyzoites liberated
- Differentiate into gametocyst in lamina propria
- Micro and macro gamete –Z oocyst (isospora type)
Sporogony: in lamina propria
Texas cattle fever caused by? (multiple choice answers)
A. Babesia
B. bovis
C. bigemina
A. Babesia
Describe the location of Balatidium coli?
Intestinal tract of arthropods and some vertebrates, mainly pigs and humans
Haemoproteus is a parasite of? (animals)
birds
Phylum of Trichomonads?
Sarcomastigophora
Position of small and large babesia in erythrocytes?
Large: merozoites located centrally (larger than the radius of the RBC).
Small:
located in the periphery of the cell (smaller than radius of RBC)
Pathology of Giardia
Attachment of trophozoite causes: (4)
- Shortening of villi
- inflammation of crypts and lamina propria,
- lesions of mucosal cells.
- Malabsorption syndrome (steatorrhea)
What is the pathology of Cryptosporidium? How is it diagnosed?
- Watery acute diarrhea, serious in young
- Diagnosis: finding thick walled oocyst by fecal sample. Carbon fuchsin
staining. Scrapings from trachea of birds. ELISA. Abs.
Pathology of toxoplasma?
Trophozoites directly destroy host cells, especially parenchymal and
reticuloendothelial cells. Lymph node infection, local hypersensitivity, blood vessel
blockage, abortions, stillbirth, chorioretinitis, hydroceohalus
Pathology of Histomonas, what are its lesions?
Lesions in cecum and liver, perforation in cecum and liver, large inflamated cecum,
yellow diarrhea, droopiness, black head
1. Invasive stage
2. Vegetative stage
3. Resistant stage
4. Flagellated stage
What are the important coccidian of poultry? Pathogenesis, clin. Signs, treatment?
Chicken:
- E.maxima – S.I
- E.tenello
Turkey:
- E.galloparones
- E.meleagrimitis
- E. adenoeidea
Goose:
- E.truncata
- E. anseris
Pathogenesis & clinical signs:
Destroys ep. Hemorrhage and malabsorption. Decreased production and weight
gain. Death.
Treatment:
Coccidiostats, vaccination, sanitation
