Almost nothing: Thimerosal has been around for decades keeping multi-dose vaccines safe until used. The epa randomly assigned a risk level for mercury exposure so as new vaccines were developed, the thimerosal was removed from most vaccines by the spring of 2001(now in inject-able flu).Suggestions that it causes autism have been disproven. A breast fed infant acquires more in bm than was ever present in the vacs.
Answered 4/21/2019
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