It isn’t like the designers and manufacturers of vaccines are in thrall to Big Mercury. Thimerosal is the best and safest vaccine additive currently known to medicine for limiting germ and bacteria growth in the vaccine. Methylmercury is absolutely dangerous in quantity - cf mad hatters’ disease - and it crosses the placental barrier, so pregnant women might want to lower their dietary intake of piscivorous fish, but the danger of the quantites in vaccines is essentially nil, certainly less than the risk of secondary infection from untreated vaccines, which in turn are far less than the dangers connected to gettingthe 'flu.
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