Question

what are a vaccine . how does a vaccine work​

Answer 1

Answer:

Vaccines safely expose the body to pathogens so that the immune system can make antibodies capable of binding to their antigens. This allows the immune system to fight off a specific disease-causing pathogen should it encounter that pathogen in the future. Vaccines expose the body to pathogenic antigens.

Answer 2

Answer:

A vaccine is a biological preparation that provides active acquired immunity to a particular infectious disease. Vaccines contain weakened or inactive parts of a particular organism (antigen) that triggers an immune response within the body. Newer vaccines contain the blueprint for producing antigens rather than the antigen itself.