الفهرس 
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Abstract
Chicken coccidiosis is an intestinal infestation caused by the
intracellular protozoan parasite of the genus Eimeria. Seven species have
been recognized to infect chickens: Eimeria tenella, Eimeria necatrix,
Eimeria acervulina, Eimeria maxima, Eimeria brunetti, Eimeria mitis, and
Eimeria praecox. Each species has its own characteristics with respect to
preferred site of infestation, pathogenicity and irnrnunogenicity.
For many years, prophylactic use of anticoccidial drugs has been the
primary means of controlling chicken coccidiosis in broiler industry and
has played a major role in the growth of this industry, Diclazuril,
Toltrezuril and Nicorbazin, were first introduced, then followed by
ionophores.
Nowadays, new treatments of coccidiosis were established such as
vaccination and the use of probiotics. Many kinds of vaccines were
introduced to the market to control coccidiosis such as those vaccines based
on live virulent strains, vaccines based on live attenuated strains, vaccines
based on live strains that are relatively tolerant to the ionophores, and non-
live subunit vaccines. On the other hand, bacteria such as Lactobacillus
acidophilus played a great role as food additives (probiotics) to control the
disease. The use of probiotics has the advantage of preventing the intestinal
colonization of entero-pathogenic microorganisms in birds by several
mechanisms.