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There is scientific contestation of possible long term adverse effects associated with certain vaccines e.g. Haemophilus Influenza type b. Observations in vaccine trials are mostly limited to trials of “new or partially tested vaccines”. This is because it would be unethical not to offer a presumably safe vaccine to a potential future sufferer of a disease that the vaccine is effective against. (Jefferson, 1998 and Claasen & Claasen, 1999)