<i>it is simple business</i><p>Yes, and I just gave you a better business case to not vaccinate.<p><i>Second, the mercury and heavy metals that fish you eat might contain are not injected into your blood and small amounts if any gets there.</i><p>Fish are the number one source of Mercury poisoning incidents, according to the USEPA (<a href="http://en.wikipedia.org/wiki/Mercury_poisoning#cite_note-EPAMercuryStudyIII-3" rel="nofollow">http://en.wikipedia.org/wiki/Mercury_poisoning#cite_note-EPA...</a>). There is no protection offered from your digestion system against this heavy metal. Your argument is irrelevant here.<p><i>childhood diseases decreased 90% between 1850 and 1940, paralleling improved sanitation and hygienic practices, well before mandatory vaccination programs</i><p>Really? Source this please, because according to wikipedia, the UK Vaccination of 1840 first introduced vaccinations, which were made mandatory by the 1853 act. (<a href="http://en.wikipedia.org/wiki/Vaccination_Act#The_1840_Act" rel="nofollow">http://en.wikipedia.org/wiki/Vaccination_Act#The_1840_Act</a>)<p>That seems to coincide pretty well with the drop in diseases, actually.