Autism and Vaccinations

What is thimerosal?

Thimerosal is a mercury-based preservative used in the manufacturing of multi-dose vaccines. It helps prevent the growth of bacteria and fungi and stabilizes vaccines so they remain effective over time. Thimerosal is necessary to prevent infections where you or your child receives an injection -- on your arm or leg, for example. The amount of mercury in vaccines is much less than the daily limit recommended for environmental exposure to mercury. For example, there is significantly less mercury in the vaccine than you would find in a can of tuna fish.

Fast Facts

If the spot where you receive an injection becomes infected, you can experience bloodstream infections or abscesses.

Does thimerosal cause autism?

No. There is no link between vaccines containing thimerosal and autism or other behavioural disorders. In fact, there are no health concerns linked to vaccines containing thimerosal. The influenza vaccines and most hepatitis B vaccines are multi-dose vaccines and contain thimerosal as a preservative.

For more information visit the Question and Answers page on Thimerosal in Vaccines and Autism.

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