Yeast in Vaccines

Yeast in vaccines?

Yeast in Vaccines

Yes, a few vaccines may contain trace amounts of yeast proteins.

Why?

Those vaccines are actually made in baker’s yeast (the growth medium), kind of like other vaccines are grown in cell cultures, etc.

And although most of the yeast proteins are removed as the vaccine antigens are removed and purified, some residual yeast proteins might remain in the vaccine.

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