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Coccidia and Coccidiosis in the Domestic Fowl and Turkey

1963; Elsevier BV; Linguagem: Inglês

10.1016/s0065-308x(08)60502-3

2163-6079

C. Horton‐Smith, P. L. Long,

Helminth infection and control

Within recent years, attention has been given to the re-examination of the pathology of coccidiosis and the life-cycles of the Eimeriidae occurring in fowls and turkeys and, especially of those species associated with disease in the avian host. The Eimeria are well suited to the application of cytochemical methods on account of their relatively large size and easy identification in host tissues. Immunity plays an important part in the epidemiology and chemotherapy of the disease (coccidiosis) associated with coccidial infestations. Attempts to determine the mechanism that develops immunity and to extend the knowledge of this complicated phenomenon have been made. This chapter discusses the consideration of these aspects of recent researches. The pathology and the life cycles of the species of Eimeria occurring in fowls and turkeys are explained. The potential oocyst production of different species of coccidia not only influences the development of the immunity in a flock but also has a direct bearing on possible economic losses. In view of the self-limiting life-cycle of coccidia, the renewed oocyst production is difficult to understand in the absence of reinfection. The chapter discusses the cytochemical characters of the various stages of coccidial life cycle and describes the immunity to coccidiosis.