Actually, they did remove mercury from most vaccines.
Please check out www.immunize.org/fda and you can read the package inserts in US vaccines.
I'm afraid I'm going from memory so I could be off a tad, but I do believe that the flu vaccine still uses thimerosal which is a mercury derivative. Mercury is not something you want to inject into the body, but, fortunately "they" did remove it from most vaccines.
Aluminum is the next questionable ingredient...it's linked to Alzheimer's...
Alzheimer is hereditary.