This book included preparation of hydatid antigen from hydatid fluid collected from Echinococcus granulosus cysts found in camels and humans. Six types of hydatid antigens were applied for immunodiagnosis of hydatid disease in a batch of sera collected from 93 cases. Characterization of the affinity purified hydatid fluid antigen was performed using SDS-PAGE & EITB. ELISA test was performed to detect different anti-hydatid antibodies (IgG, IgM and IgA) using different preparations of the camel and human antigens. Also sandwich ELISA was performed to detect hydatid circulating antigen using...