Al-Alousi, M. et al. 2023. The Prevelance of Hepatitis B Surface Antigen (HBsAg) Among Blood Donors in Some Hospitals of Thamar, Yemen. Thamar University Journal of Natural & Applied Sciences. 5, 1 (Jan. 2023), 1–9. DOI:https://doi.org/10.59167/tujnas.v5i5.1300.