Question

What is a vaccine? How does it works? Explain

Answer 1

Answer:

Explanation:

A vaccine works by training the immune system to recognize and combat pathogens, either viruses or bacteria. To do this, certain molecules from the pathogen must be introduced into the body to trigger an immune response. These molecules are called antigens, and they are present on all viruses and bacteria

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Answer 2

Answer:

a vaccine is a type of medicine that train's body immune system so that it can fight disease it has not come into contact with before . vaccines are designed to prevent disease, rather than treat a disease once you have caught it.