20 фев 1879 г. - Begins studies in the field of vaccination
Описание:
After accidentally exposing some chickens to an aged form of the cholera virus, they become resistant to the disease. This was the beginning of the vaccination firld.Добавлено на ленту времени:
Дата:
20 фев 1879 г.
Сейчас
~ 146 г назад