Kareem, A. M., Mohammed, Y., and Rogo, L. D. “Seroprevalence of Hepatitis B Virus Surface Antigen Among Butchers and Slaughtered Cows in Kano Metropolis, Nigeria”. UMYU Journal of Microbiology Research (UJMR), vol. 2, no. 2, Dec. 2017, pp. 104-9, doi:10.47430/ujmr.1722.016.