ABSTRACT
Diagnosis and quantification of Echinococcus granulosus in-fection in man and animal hosts are centralized to feasible con-trol this study included 93 serum sample, 25 sure positive hydatid cases confirmed surgically, 7 suspected cases diagnosed by indirect haemagglutination IHA and 41 cases other parasitic infection [15 S. mansoni, 8 fasciola, 7 Ascaris, 5 H. nana and 6 Ancylostoma] diagnosed by microscopic examination and were negative by ELISA and/or IHA for anti-hydatid antibody. Twen-ty negative serum samples served as healthy controls. Six types of hydatid fluid antigens [crude, host-free and Con-A purified] of human and camel origin were subjected to electrophoretic separ-ation [SDS-PAGE] and immunoblotting [EITB]. The anti-hydat-id IgG was detected in sera of the different groups for evalua-tion of sensitivity, specificity and diagnostic efficacy each type of antigens. Detection of circulating hydatid antigen [CAg] was performed using anti rabbit hyperimmune sera raised again-st Con-A purified either human or camel hydatid antigen. SDS-PGE revealed several bands ranging from 55-185- kDa with 10kD band shared by all antigens. The specific bands revealed by EITB for Con-A purified camel and human antigens were at 80, 110, 55, 110 kDa respectively. ELISA highest sensitivity [96.9%] was by using host-free Con-A purified glycoprotein fraction of human hydatied antigen. Highest specificity [98.4%] was reco-rded upon use of either Con-A purified camel or human antigen with 94.5% and 97.7 and diagnostic efficacy respectively. Detection of circulating antigen by polyclonal antibodies against Con-A purified human hydatid antigen revealed 91.8%specificity.