Thimerasol is a preservative that is used in multi-dose vials of the H1N1 and seasonal flu vaccines. Redness and swelling at the injection site are the only side effects associated with the vaccines' low dose of thimerasol, which contains ethylmercury. (Note: In high doses, methylmercury, a different form of mercury than those in vaccines, can cause toxicity.)
If you have concerns about exposure to any mercury, request a vaccination specifically from single dose vials, which do not contain thimerasol. The nasal spray form of the vaccine is also thimerasol free, however, pregnant women should not take the nasal flu vaccine.
You should also know that it is not recommended that you take either the H1N1 vaccine or the seasonal flu vaccine if you have an allergy to eggs. This is because the vaccines are made with egg bases.
If you have concerns about how the vaccine will affect you, don't be worried. The reactions to the H1N1 vaccine are similar to those we see with the seasonal flu vaccine. These can include
- Soreness at shot location
- Redness, or swelling where the shot was given
- Fever (low grade)
- Aches
Generally these are mild and only last for a day or two. You should contact your doctor or midwife with any concerns that you have about reactions.
Some women and their practitioners are deciding against vaccination for the H1N1 flu and/or seasonal flu. This should be a decision made when looking at the risk factors that you have for contracting the flu, other health concerns you may have like chronic conditions as well as your health care providers in put.
Sources:
2009 H1N1 Influenza Vaccine. Center for Disease Control and Prevention. 08 Oct 09.
Suspension of Thimerosal (Mercury)Limits for H1N1 (Swine Flu) Vaccine: Frequently Asked Questions. Washington State Department of Health. 08 Oct 09.
