Thimerosal
November 4th, 2009 by PotatoFrom Health Canada:
The H1N1 vaccine contains 2.5 micrograms organic mercury (Hg) per 0.5mL dose.
Tuna can contain over 0.5 ppm of mercury, so 5 g of tuna would give you as much mercury as the shot — about 1/30 of a can.
The vaccine in no way represents a medically significant dose of mercury.