UPDATE ON PREVALENCE, DIAGNOSIS AND TREATMENT OF HEPATITIS B VIRUS ESSAY Submitted for the partial Fulfillment of the Master degree in Tropical Medicine Presented by Dr. Hesham Noaman Abdel Raheem Mustafa (M.B., B.Ch.) Under Supervision of Dr. Laila Ahmad Mohammad Professor of Tropical Medicine Faculty of Medicine Cairo University Dr. Ahmad Nabil Lotfy Hassan Lecturer of Tropical Medicine Faculty of Medicine Cairo University Faculty of Medicine Cairo University 2005