12 апр 1955 г. - Polio Vaccine
Описание:
Salk tested his experimental killed-virus vaccine on himself and his family in 1953, and a year later on 1.6 million children in Canada, Finland and the USA. The results were announced on 12 April 1955, and Salk's inactivated polio vaccine was licensed on the same day.Добавлено на ленту времени:
Дата:
12 апр 1955 г.
Сейчас
~ 70 г назад