“This first detailed analysis of a recent North American pertussis outbreak found widespread disease among fully vaccinated older children. Starting approximately three years after prior vaccine dose, attack rates markedly increased, suggesting inadequate protection or durability from the acellular vaccine.”
http://articles.mercola.com/sites/articles/archive/2012/07/30/whooping-cough-vaccine.aspx?e_cid=20120730_DNL_artNew_1
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