Kutjok, P., and S. NYICAR. “ Prevalence of COVID – 19 Infection and Associated Risk Factors Among Travelers at Medblue Modern Laboratories Center, Juba, South Sudan”. IJRDO-Journal of Applied Science, Vol. 7, no. 10, Oct. 2021, pp. 01-06, doi:10.53555/as.v7i10.4646.