I got my flu shot today, the one branded as the FLUCELVAX® Quad 2023-24.
It’s the first flu vaccine in the United States that was cultured in cells* and not in chicken eggs.
Some observational studies have shown cell culture-based vaccines to provide greater protection against flu or flu-like illness (as opposed to ones grown in eggs).
*From the CDC’s website: ‘Cell culture-based flu vaccine production does not require chicken eggs because the vaccine viruses used to make vaccine are grown in mammalian cell cultures (no animals are harmed by this process)’.
[Source: https://www.cdc.gov/flu/resource-center/shareable-resources.htm]