What are two uses for vaccines?

Answer:

Vaccines, which are given for bacterial and viral infections, are mixtures that contain either part of pathogens or whole pathogens that prepare the body's defenses to fight against the pathogens. Active immunization helps the body create defenses against the pathogen before an infection occurs. Passive immunization is given to people with a weakened immune system or to those who have an existing infection. Its temporary effects will provide the body with the necessary defenses to fight the pathogen.