Then, the outer membranes that contain the ‘ surface antigens’ (proteins on the outer membrane of the virus that the body recognises as foreign) were extracted and purified before being included in the vaccine.
Καταρχάς, ο ιός που χρησιμοποιείται στο εμβόλιο αδρανοποιείται (νεκρώνεται) ώστε να μην προκαλεί ασθένειες.