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PROTOSCOLICES ANTIGENS FROM HYDATID CYST OF HUMAN AND ANIMAL ORIGIN FOR DIAGNOSIS OF CYSTIC ECHINOCOCCOSIS

Hydatid cyst (HC) protoscolices somatic antigens (HCPsS-Ag) derived from the HC extractedfrom patients, sheep; equine and HC antigen purchased with ready-made diagnostic kits wereevaluated in diagnosis of zoonotic hydatidosis. The sensitivity and specificity of these antigensin capturing anti-HC-IgG-antibodies (anti-HC-Abs) were measured by ELISA in infected hosts’sera. Sensitivity of HCPsS-Ag extracted from HC of human origin to diagnose anti-HC-Abs innaturally patients was 90.0%. The sensitivity of HCPsS-Ag extracted from sheep, equine andready-made diagnostic kits (R.M.K.) were (71.4%; 57.1% & 91.9%) respectively. The medianELISA OD values of positive HC patient samples versus HCPsS-Ag of sheep and equine wassignificant (P≤0.05) lower than screened same sera versus HCPsS-Ag of human origin. Foragreement analysis, Kappa values did show significant difference between human sera versusHC antigen extracted from human or sheep (K= 0.385, P=0.168). Receiver Operating Characteristics(ROC) analysis showed accepted human diagnosis by using human or sheep originatedantigens. HCPsS-Ag of human origin showed low cross-reaction with Schistosoma mansoni andHepatitis C virus, than those of animal origin.