Wafa Ibrahim Elhag ***3Nafisa Osman Mohammed*1, Nafisa Ahmed Ibrahim **2,. 2017. “SEROFREQUENCY OF HEPATITIS D VIRUS AMONG HEPATITIS B INFECTED PATIENTS, KHARTOUM STATE, SUDAN.”. Journal of Biomedical and Pharmaceutical Research 4 (5). http://jbpr.in/index.php/jbpr/article/view/226.