Myth: The flu vaccine contains thiomerosal, which may be harmful.
Thiomerosal — a preservative that contains mercury — has never been shown to be harmful, Cunningham said. The type of mercury linked with nervous system damage is methyl mercury, he said. Concerns over methyl mercury levels have led to recommendations that pregnant women avoid eating large amounts of certain types of fish, such as swordfish.
In contrast, thiomerosal is an ethyl mercury compound.
Still, because the preservative raised controversy, especially over a now-disproven link to autism, it was taken out of almost all U.S. vaccines starting in 2001, Cunningham said.
The injectable form flu vaccine is available to health care providers in two ways — they can get large bottles of it, which contain many doses, or they can small bottles, which contain an individual dose of the vaccine.
There is a tiny amount of thiomerosal in the multidose bottles. The preservative ensures that no bacteria will grow in the vaccine, Cunningham said. The individual-dose bottles contain no thiomersal. People concerned about the compounds effects can ask their provider for an individual dose.
The nasal spray form of the flu vaccine contains no thiomerosal, he noted.
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