PQ 6

Question 1

What is the pathology of Cryptosporidium? How is it diagnosed?

Answer 1

Diagnosis: finding thick walled oocyst by fecal sample.
Carbon fuchsin staining
Scrapings from trachea of birds

Question 2

Pathology of toxoplasma?

Answer 2

The trophozoites directly destroy host cells, especially parenchymal and reticuloendothelial
cells.
Lymph node infection, local hypersensitivity, blood vessel blockage.
Abortions, stillbirth, chorioretinitis, hydroceohalus

Question 3

Pathology of histomonas, what are its lesions?

Answer 3

1. Invasive stage
2. vegetative stage
3. so-called resistant stage
4. flagellated stage

cecal and liver lesions