Question

what is a vaccine????????​

Answer 1

Explanation:

A vaccine is a biological preparation that provides active acquired immunity to a particular infectious disease. A vaccine typically contains an agent that resembles a disease-causing microorganism and is often made from weakened or killed forms of the microbe, its toxins, or one of its surface proteins.

Answer 2

Answer:

They contain dead virus, incapable of infecting people but still able to instruct the immune system to mount a defensive reaction against an infection.

Explanation:

hope this will help u.

mark it as brainliest