Verified Answer :

saya

Vaccines contain dead bacteria to get ready to fight the real bacteria/virus. Imagine like that every time you take a vaccine the body makes a blueprint of it. Then, when the virus/bacteria comes, the body knows the bacteria/virus because they made a blueprint. Now, the flu vaccine is different because they change very much. They change every year, so that is why you take flu vaccines yearly.

mero9319

Adjuvants help vaccines work better, longer and faster; Added preservatives to keep multi-dose vaccine vials sterile; Antibiotics to prevent bacterial growth during vaccine preparation;