A study that measured antibodies and the disease history of more than 200 kids found that two doses of vaccine were 98 percent effective in preventing chickenpox compared with 86 percent for a single dose.
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Read the complete post at http://www.npr.org/blogs/health/2011/01/10/132801420/to-beat-chickenpox-2-shots-of-vaccine-are-best?ft=1&f=103537970
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Jan 10 2011, 06:58 AM
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NPR Blogs: Shots - Health News Blog