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Abstract
In the Present study , five selected antigens ( Schistosoma mansoni Execretory – secretory (E /S) antigen S. mansoni cercarial Ag, F .Gigantica (E/S) Ag , Toxocara Canis Crude Ag and Cysticercus Cellulosae
Crude Ag ) were Prepared . They Were Used in Vaccination Of separate Grodps of mice. The level of protection Versus S. mansoni infection after
Vaccination Was estimated Via 3 Parameters including : Reduction in the Produced Worms; Degree of histo -pathological Changes recorded in liver
& Spleen; Alteration in the level of immunoglobulins in Sera of Vaccinated mice befor and after challenge With Special references to Determination t the level of Cross - reaction between each type of the Produced antibodies and that produced against S. mansoni.