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What is thimerosal and does the 2009 H1N1 influenza vaccine contain thimerosal?

April 26, 2017contain h1n1 Influenza thimerosal vaccine

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What is thimerosal and does the 2009 H1N1 influenza vaccine contain thimerosal?

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Thimerosal is a mercury-based preservative that has been used for decades in the United States and internationally in multi-dose vials (vials containing more that one dose) of some vaccines to prevent the growth of microorganisms, such as bacteria and fungi, which may contaminate them. The 2009 H1N1 influenza vaccines that FDA licensed are manufactured in several formulations. Some are produced in multi-dose vials and contain thimerosal as a preservative. Some 2009 H1N1 influenza vaccines are also produced in single-dose units and do not contain thimerosal. In addition, nasal spray is produced in single-dose units and does not contain thimerosal. More information is available at http://www.cdc.gov/h1n1flu/vaccination/thimerosal_qa.