News accounts of the effect of a weaker DTP vaccine ignore the fact that it was 'diluted" in response to panic about the vaccine's safety that was bogus. The Precautionary Principle has harmed thousands of children...
http://abcnews.go.com/Health/Wellness/whooping-cough-vaccine-effective-early-form-study-finds/story?id=16898211#.UBmQU8j3v5h
http://abcnews.go.com/Health/Wellness/whooping-cough-vaccine-effective-early-form-study-finds/story?id=16898211#.UBmQU8j3v5h