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This is a confusing subject for many people. H1N1/09 "Swine Flu" is a disease caused by an influenza virus infection and mostly affects the respiratory system. A vaccine is medication used to prevent a disease, in this case to prevent the swine flu. When you use the vaccine, your body will develop immunity to the disease. Immunization is what happens when your body learns how to fight a disease and remembers how to do that for the rest of your life (lifetime for the flu, and not all, but many, other kinds of Infectious Diseases), as long as you are otherwise healthy. Being protected from a disease by having the disease (which teaches your body how to rid you of it), or by getting a vaccination to "train" your body how to protect you from it, is called having "immunity." When you are vaccinated, it is also called getting immunization or immunized against a disease. Vaccines cause immunity by providing immunization.

See the related question below about how vaccinations work.

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14y ago

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