Well regarding mercury, it has been phased out of most vaccines in the US and European Union.
> "FDA is continuing its efforts toward reducing or removing thimerosal from all existing vaccines." [1]
Note to self: don't touch dimethylmercury even with nitrile gloves, it goes right through within seconds. The last person to do so, KW, slowly turned into a vegetable and was ultimately euthanized [2, 3]
[1] https://www.fda.gov/BiologicsBloodVaccines/Vaccines/Question...