I dug around and found vaccines.gov which says that there are four vaccine types: • Live-attenuated vaccines: these use a weakened (or attenuated) form of the

I dug around and found vaccines.gov which says that there are four vaccine types: • Live-attenuated vaccines: these use a weakened (or attenuated) form of the germ that causes a disease. • Inactivated vaccines: these use the killed version of the germ that causes a disease. • Subunit, recombinant, polysaccharide, and conjugate vaccines: these use specific pieces of the germ — like its protein, sugar, or capsid (a casing around the germ). • Toxoid vaccines: these use a toxin (harmful product) made by the germ that causes a disease. They create immunity to the parts of the germ that cause a disease instead of the germ itself. https://www.vaccines.gov/basics/types https://www.vaccines.gov/basics/types