1 янв 1796 г. - Vaccination
Описание:
Vaccine was first introduced by Edward Jenner in 1796 and is still present today. The smallpox vaccine was the first successful vaccine to have developed. Vaccine is the administration of antigenic material to stimulate an individual's immune system! Vaccines can prevent infectious diseases.Добавлено на ленту времени:
Дата:
1 янв 1796 г.
Сейчас
~ 228 г назад
