September 2019. Retrieved 13 September 2019. Wilfredo Gutiérrez (2011). "Poliomielitis paralítica causada por la vacuna oral sabin ¿tiempo de cambiar de vacuna...

continued in the male line. Since early childhood, Kobozev was ill with poliomielitis. Since the 1920s, he had had a number of serious diseases, including...