Flashcards in Parasitic protozoa- Coccidiosis Deck (14)
What is coccidiosis?
- An enteric disease causing by Eimeria
- faecel-oral transmission
-all breeds/ ages susceptible
-high morbidity/ mortality in young
- Major problem in poultry
What are the challenges of coccidiosis?
- Residues, particularly of ionophores, in food and eggs. Could cause adverse effects on humans,
What are the clinical signs chicken present with?
- Loss of appetite
(PM finds= haemorrhage in caeca- Eimeria tenella)
What are the clinical signs in a rabbit?
-Enlarged liver with multifocal greyish lesions/ nodules and presence of yellow liquid (Eimeria Stidae)
What species of Eimeria are found in broiler chickens?
- E. acervuline, E. necatrix and E.tenella
What is a sporozoite?
A spore, formed inside oocyst of some coccidian species AFTER maturation of the oocyst. INFECTIOUS UNIT. Infects intestinal cells and oocyst ingestion.
Which Eimeria species are responsible for coccidiosis in cattle?
(Long PPP 17-22 days)
Which mechanisms are responsible for poor growth in coccidiosis?
-Small intestinal mucosa is damages= atrophy of the villi leading to loss of mucosal enzymes (malabsorption/ maldigestion) FUNTIONAL DISORDER
- Barrier function compromised STRUCTURAL DISORDER
- Secondary infections leading to mucosal inflammation and immune reaction
Describe sub-clinical coccidiosis
-Big economic burden
-Is carcass is emaciated it is condemned
How do you diagnose coccidiosis?
-Pathology diagnosis is specific but time consuming
Describe the lesion scored used in pathological diagnosis of cccidiosis
0= no lesion
1=very mild changes
2= mild lesions
3= quite severe damage
4= severe damage to intestines
Describe E. acervulina
-Causes mild disease in upper SI
-Affects older chickens
-Laying hens= lower egg yield
-Lesions in duodenum
-Causes severe disease in the small intestine