30 апр 1796 г. - Jenner performed key experiment
Описание:
treated lady for cowpox then transferred fluid from pustule on her arm to young boy who recovered after 9 days. when innoculated with smallpox he showed no symptomsДобавлено на ленту времени:
Дата:
30 апр 1796 г.
Сейчас
~ 229 г назад