Flu Myths and Realities
"Vaccines that contain thimerosal are unsafe for children and pregnant women.”

It is safe for children and pregnant women to receive a flu vaccine that contains thimerosal.

Thimerosal is a very effective preservative that has been used since the 1930s to prevent contamination in some multi-dose vials of vaccines. There is no convincing evidence of harm caused by the low doses of thimerosal in vaccines, except for minor reactions like redness and swelling at the injection site.

The 2009-H1N1 influenza vaccines that FDA has licensed will be manufactured in several formulations, including pre-filled, single-dose syringes and nasal sprayers along with multi-dose vials. Only multi-dose vials of seasonal influenza vaccine will contain thimerosal to prevent potential contamination after the vial is opened. Single-dose units, however, will not require the use of thimerosal as a preservative. You may request this form of the vaccine if it is available. In addition, the nasal spray version of the 2009 H1N1 vaccine is produced in single-units and will not contain thimerosal..."