Sahak, Shukrullah, et al. “Prevalence of the Novel COVD-19 in Nangarhar Province Corona Center Hospital During June 2020 to August 2021”. Nangarhar University International Journal of Biosciences, vol. 2, no. 03, Sept. 2023, pp. 72-79, doi:10.70436/nuijb.v2i03.71.