Immunological Studies of Infection, Treatment, Vaccination and their Longivity of Immune Responses in Murine Schistosomiasis: A Thesis Submitted to Department of Zoology Faculty of Science Cairo University in Partial Fulfillment to the Requirements for the Degree of Master of Science (Immunoparasitology) / by Wael Ibrahim Zaki Ashour; Supervision Committee Kamal S. Al-Badry, Maged M. Al-Sherbieny, Ahmed M. Osman. Ashour, Wael Ibrahim Zaki.