Here’s the current situation regarding mercury (specifically thimerosal) in influenza and COVID-19 vaccines:
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What “mercury” in vaccines means
- Vaccines do not contain elemental mercury or the kind of methylmercury people worry about in fish.
- The only mercury-related compound ever used in some vaccines is thimerosal (also spelled thiomersal), which is an ethylmercury-containing preservative used to prevent bacterial contamination in multi-dose vials.
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Flu (influenza) vaccines
- Historically, some multi-dose flu vaccine vials used thimerosal to keep the vaccine safe during repeated use.
- However, in recent years, health authorities in the United States have moved to remove thimerosal from all flu vaccines, recommending only single-dose, mercury-free influenza shots.
- Most flu shots (around 94%) were already thimerosal-free before this policy.
- U.S. policy now generally phases out flu vaccines with thimerosal entirely.
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COVID-19 vaccines
- The authorized COVID-19 vaccines (e.g., mRNA vaccines like Pfizer and Moderna) do not include thimerosal or any mercury-based ingredient in their formulations.
- COVID-19 vaccines use different components (like mRNA and lipid nanoparticles) and do not require preservatives like thimerosal.
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Scientific and regulatory context
- Thimerosal was removed from most routine childhood vaccines in the U.S. and Europe decades ago as a precaution, not because of evidence showing harm.
- Extensive reviews by regulators and the World Health Organization have found no credible evidence that thimerosal at vaccine-level exposure causes neurological harm.
Bottom line
✅ Current flu vaccines in the U.S. are largely free of mercury (thimerosal).
✅ COVID-19 vaccines do not contain mercury-based preservatives.
⚠️ Only historical formulations and multi-dose vials used thimerosal, and its use is now being phased out.
If you want, I can list exactly which vaccine brands/formulations (flu or COVID-19) contain or don’t contain thimerosal this season.
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