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→Coccidia of Poultry
'''Immunity'''
'''Immunity'''
*Different ''Eimeria'' species produce different levels of protective immunity
**''E.maxima'' -> ''E.brunetti'' and ''E.acervulina'' -> ''E.tenella'' and ''E.necatrix''
*There is no cross immunity between species
*There is very little passive immunity
*Evokes a cell-mediated response
*All ages of poultry are susceptible
'''Epidemiology'''
'''Epidemiology'''
*Oocysts are ubiquitous and robust
**Able to survive several months to years
*It is impossible to keep buildings free from infection
**Chicks become infected by pecking the ground shortly after being placed in the poultry house
*Biotic potential is enormous
**Generation time is short
**Massive infections can build up rapidly
*Immunity develops relatively slowly
**With high stocking densities the situation is explosive
'''Control'''
'''Control'''