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A person can get lifelong immunity against chicken pox if he is vaccinated for the disease.
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In most cases, getting chickenpox once means you will not get it again. This is called lifelong immunity. However, in rare cases, a person gets it again.
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Once you have had chickenpox or got vaccinated, you usually develop antibodies to the infection and become immune to catching it again. However, the virus that causes chickenpox, the varicella-zoster virus, remains inactive (dormant) in your body's nerve tissues and can return later in life as an illness called shingles.
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