There are no chick embryos in vaccines.
Some vaccines, like MMR, are made or are grown in chick embryo fibroblast cells.
Others, like most flu vaccines and the yellow fever vaccine, are actually grown in the allantoic sacs of chick embryos.
But just like vaccines that are grown in baker’s yeast, most of the egg proteins are removed as the vaccine antigens are removed and purified.
For more information:
- Ingredients in Vaccines
- Vaccine Ingredients – Egg Products
- Contraindications and Precautions to Commonly Used Vaccines
- Egg Allergy and the Flu Vaccine