http://articles.mercola.com/sites/articles/archive/2004/03/17/chickenpox-vaccine-part-five.aspxAn outbreak of chickenpox in a Lake Oswego elementary school caught health officials by surprise considering 18 children infected had already been vaccinated for the disease. The conclusions from this study suggested that the immunity of the vaccinationenCommunityServer 2008.5 SP1 (Build: 31106.3070)