Nadav Orr, Klement, Eyal , Gillis, David , Sela, Tamar , Kayouf, Raid , Derazne, Estela , Grotto, Itamar , Balicer, Ran , Huerta, Michael , Aviram, Lisa , and others, . 2006. “Long-Term Immunity In Young Adults After A Single Dose Of Inactivated Hepatitis A Vaccines”. Vaccine, 24, Pp. 4328–4332.