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I don't know if thiomersal is still even used in any vaccines, but even if it is, it's not "mercury".
Thiomersal is an organic complex of mercury added in such a small dose that it doesn't have any biological effect on humans.
A side note: we ingest much higher doses of mercury in some fish (still, small and safe) and we even place mercury permanently in our bodies in the form of amalgam tooth fillings (non reactive).