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Just wanted to add that this is a common problem with vaccines. ...consider an actual measles outbreak in Colorado in December 1994.5 Out of 625 children exposed to the disease, 17 got measles. Of those 609 who had previously been vaccinated, only 10 (or 1.6%) developed measles. Of the 16 children who were not immunized, 7 (or 44%) developed measles. ...


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There are two other, but rather exotic possibilites which explain why people do not develop immunity after an diphtheria infection. These are unlikely to get to 6-8% of the cases which @Masi writes, but I am missing the reference here. The first possibility are people with chronic renal failure. They have problems with their immune responses since their ...


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In this article they look at the development of natural immunity to diptheria in those who were vaccinated. I could not find any studies on people who had acquired it naturally. http://www.sciencedirect.com/science/article/pii/S0264410X97001485 They found that the development of immunity to diptheria vaccine depended on several factors: Time lapsed since ...



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