8 янв 1957 г. - Polio

Описание:

Albert Sabin also develops Vaccine, however different from Salks. Sabin's Vaccine houses a weakend alive form of Polio that is administered orally and can by done by anyone and is less expensive, however does need to be refrigerated when in transport which causes a problem in places where refrigeration isn't convenient or available.

Добавлено на ленту времени:

Дата: