from: https://www.cdc.gov/vaccinesafety/concerns/thimerosal/index.html https://www.cdc.gov/vaccinesafety/concerns/thimerosal/index.... "Thimerosal contains ethy

from: https://www.cdc.gov/vaccinesafety/concerns/thimerosal/index.html https://www.cdc.gov/vaccinesafety/concerns/thimerosal/index.... "Thimerosal contains ethylmercury, which is cleared from the human body more quickly than methylmercury, and is therefore less likely to cause any harm."