Why Are There Dangerous Ingredients In Vaccines?

To learn more about this topic, start your googling with these keywords: 

adjuvant: substance added to a vaccine to enhance the body's immune response and increase the vaccine's efficacy

attenuation: altering a pathogen to make it less virulent (or even harmless)

acquired immunity: components of the immune system that are developed via exposure to pathogens or other sources of infection

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