Sami, S.M., Salama, I.I., Abdel-Latif, G.A., El Etreby, L.A., Metwally, A.I. and Abd El haliem, N.F. 2016. Hepatitis B Seroprotection and the Response to a Challenging Dose among Vaccinated Children in Red Sea Governorate. Open Access Macedonian Journal of Medical Sciences. 4, 2 (May 2016), 219–225. DOI:https://doi.org/10.3889/oamjms.2016.043.