Land of Letters.
A blog about raising kids with ASD, ADHD, SPD, PDA (Pathological Demand Avoidance).
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Sunday, October 30, 2011
Heard about Herd Immunity?
Interested in contemporary vaccine information? I encourage people to check out this informative site.
http://www.vaccinetimes.com/how-do-we-know-that-herd-immunity-exists/
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