Researchers also found that COVID-19 vaccine effectiveness waned over time.
Removal of mercury from U.S. vaccines was recommended over two decades ago, yet some flu vaccines contain up to 25 micrograms of thimerosal.
Researchers also found that COVID-19 vaccine effectiveness waned over time.
Removal of mercury from U.S. vaccines was recommended over two decades ago, yet some flu vaccines contain up to 25 micrograms of thimerosal.