This is more of a complex issue that most people here understand, so I will keep it short and simple…
Thimerosal is still used in vaccines, but there are manufacturers that are making vaccines without it. At high exposure levels, mercury causes neurotoxicity in humans, especially in fetuses and small infants whose brains are still developing, so I would suggest that parents request their children be vaccinated with Thimerosal free vaccines, problem solved.
….BTW, I do actually know what I am talking about here, Graduate of the USC school of Pharmacy, PharmD.