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3k.7 How long does immunity last?




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This article is from the Childhood Vaccinations FAQ, by Lynn Gazis-Sax lynng@alsirat.com with numerous contributions by others.

3k.7 How long does immunity last?

Firm data on long-term protection are limited because the vaccine was
under investigation for only 4 years before being approved in
1995. Estimates of antibody persistence derived from kinetic models of
antibody decline suggest that the protective levels of anti-HAV could
persist for at least 20 years.

 

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