Resumo (EN)
Broiler chicks commercially raised are exposed to a number of factors which may compromisse the competence of the immune system, possibly increasing susceptibility to coccidia infection. Coccidiosis causes the activation of both humoral and cellular immune responses, the latter being responsible for the protection against coccidiosis. The present review focuses the dynamics of the avian immune response against coccidiosis and describes the major immunosuppressive factors which may be present in broiler chicken commercial breedings.