Immunity to diphtheria and tetanus among blood donors in Arak, central province of Iran - Eslamifar, Ali; Ramezani, Amitis; Banifazl, Mohammad; Sofian, Masoomeh; Alsadat-Mahdaviani, Fatemeh; Yaghmaie, Farhad; Aghakhani, Arezoo (Iranian Journal of Microbiology)