Tehran University of Medical Sciences Iranian Journal of Public Health 2251-6085 6 2 1977 06 15 39 45 K. Nasseri 2015 10 03 Between 15 October and 23 December 1975, a total of 22 cases of infectious hepatitis were reported from an upper class private school in the suburbs of Tehran. Careful examination revealed that one of the early cases had transmitted the disease to other children in the school during the last days of the incubation period. https://ijph.tums.ac.ir/index.php/ijph/article/view/2727 https://ijph.tums.ac.ir/index.php/ijph/article/download/2727/2707