By Kristina Duda, R.N., About.com
Updated February 13, 2007
About.com Health's Disease and Condition content is reviewed by our Medical Review Board
When you have an immunity to something, it means that your body can fight that disease or infection without you knowing it.
When you get sick, your body is fighting off a disease and you feel symptoms depending on what that illness is.
Being immune to a disease means that your body is able to kill the germs without causing any symptoms.
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