Coccidiosis remains one of the most economically important diseases in poultry production in-spite of advances made in prevention and control through chemotherapy, management, nutrition and genetics. In all parts of the world where confinement rearing is practiced, coccidiosis represents a major disease problem demanding the attention of poultry producers, feed manufactures, and poultry disease experts. Substantial work on coccidiosis based on experimental infections and drug and vaccine trials has been presented over many years. However, reports on infection prevalence, infection levels and frequencies of the different Eimeria species in commercial poultry productions are few and sporadic. Often the reports are not comparable due to the difference in management and production systems, sample materials, sampling periods, sampling methods and prophylactic measures applied. This book, therefore, fills all the aforementioned gaps and provides a detailed study of poultry coccidiosis and the results of this study will serve as an input for poultry producers, feed, drug and vaccine manufactures, and poultry disease experts, or anyone else involved in coccidiosis research...