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Do flu shots contain mercury?

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Flu vaccines in multi-dose vials contain thimerosal to safeguard against contamination of the vial. Most single-dose vials and pre-filled syringes of flu shot and the nasal spray flu vaccine do not contain a preservative because they are intended to be used once. read more

All vaccines routinely recommended for children 6 years of age and younger in the U.S. are available in formulations that do not contain thimerosal. The use of thimerosal as a preservative in vaccines has declined due to reformulation and development of new vaccines in single-use presentations. read more

Single dose-shots of the flu vaccine and the flu vaccine nasal sprays do not contain any mercury compounds. The multi-dose flu shot does contain a preservative called thimerosal, which breaks down into 49% ethylmercury and used to prevent bacterial contamination of the vaccine container. read more

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