Coccidiosis Flashcards
What are the main life cycle stages of protozoan?
Zygote, Sporozoites, Merozoites, Gameotocytes
What are the 3 main coccidian that infect cattle and which is more pathogenic?
Eimeria Bovis, E. Alabamesis and E.Zuernii. E.Zuernii is the most pathogenic.
Where are coccidia found?
Gastrointestinal tract
What coccidia effect calves turned out in spring?
E. alabamensis.
What is the clinical signs of coccidiosis in cattle?
Diarrhoea, blood, weight loss. On post mortem inflammation and thickening of caecum, ilium and colon.
What 2 species of coccidia are of clinical importance in sheep and when are they seen?
E. Ovinoidalis and E. Crandalis. Commonly seen in young lambs as ewes are immune carriers.
What species of coccidia is clinically significant in pigs?
Isospora suis as it causes profuse diarrhoea in unweaned piglets.
What is the lifecycle of coccidiosis in cattle
Birds ingests oocysts. Oocysts release oocytes. 3-4 stages of sexual schizogony. Sexual development stage of gametogeny. Oocyst shed in faeces.
What must oocysts go through to become infective?
Asexual division (sporogony or sporulation)
What are the two main species in the malabsorption group of avian cocciosis?
E. acervulina and E.Maxima
What are the 3 main species in the haemorrhagic group of avian coccidiosis?
E. Tenella. E. Necatrix. E. Brunetti.
At post mortem a proximal gut thickening with white lesions indicates which avian coccidiosis?
E. Acervulina
At post mortem a mid gut thickening with pink exudate indicates which avian coccidiosis?
E, Maxima
At post mortem a mid gut ballooning with white lesions indicates which avian coccidiosis?
E. Necatrix
At post mortem a swollen caeca that is thickened and dark indicates which avian coccidiosis?
E. Tenalla
What is the vaccine used for avian coccidiosis ? What is the problem associated with it?
Paracox. Results in sub-optimal growth rates
How do you control coccidiosis in broilers?
Continuous use of in-feed prophylactic drugs
How do you control coccidiosis in replacement layers?
Must be allowed to develop immunity so either vaccinated or subjected to a ‘step down’ medication regime.
How do ionophores work?
They allow immunity to develop by reducing oocyte production. They cause sodium to rush into sporozoite and water follows. The structural damage leads to organism death
What is the problem with using anti-coccdial drugs that kill the coccidia?
They do not allow any immunity to build up in the flock and increase the levels of coccidial resistance.
