Some vaccines contain mercury – truth
Thimerosal, a preservative containing about 50% mercury, prevents contamination by bacteria. It can be found in most flu shots, according to the Centers for Disease Control and Prevention (CDC).
However, since 2001, thimerosal has not been present in routine vaccines for children younger than 6. And, both the flu shot and some vaccines for adults and older children can be found in thimerosal-free versions, or with only trace amounts.