Parasitic protozoa- Coccidiosis Flashcards Preview

PVS Parasite week > Parasitic protozoa- Coccidiosis > Flashcards

Flashcards in Parasitic protozoa- Coccidiosis Deck (14)
Loading flashcards...
1

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

2

What are the challenges of coccidiosis?

- Residues, particularly of ionophores, in food and eggs. Could cause adverse effects on humans,

3

What are the clinical signs chicken present with?

- Loss of appetite
-Emaciation
-Anaemia/ weakness
-Diarrhoea
-Weight loss
-Death
(PM finds= haemorrhage in caeca- Eimeria tenella)

4

What are the clinical signs in a rabbit?

-Enlarged liver with multifocal greyish lesions/ nodules and presence of yellow liquid (Eimeria Stidae)

5

What species of Eimeria are found in broiler chickens?

- E. acervuline, E. necatrix and E.tenella

6

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.

7

Which Eimeria species are responsible for coccidiosis in cattle?

-E. bovis
-E. zuernii
(Long PPP 17-22 days)

8

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

9

Describe sub-clinical coccidiosis

-Very common
-Big economic burden
-Is carcass is emaciated it is condemned

10

How do you diagnose coccidiosis?

-Lab diagnosis
Metabolic parameters
Faecel smears
McMaster method
PCR
Serology

-Pathology diagnosis is specific but time consuming

11

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

12

Describe E. acervulina

-Causes mild disease in upper SI
-Affects older chickens
-Laying hens= lower egg yield
-Lesions in duodenum

13

Describe E.necatrix

-Causes severe disease in the small intestine
-Blood diarrhoea
-Death

14

Describe E.tenella

Severe dissease in he caecae (ONLY involved caecum)
-Severe disease in chickens under 6 months