Here are some links that provide more information on how we make and regulate the flu vaccine. https://www.cdc.gov/flu/prevent/how-fluvaccine-made.htm https://

Here are some links that provide more information on how we make and regulate the flu vaccine. https://www.cdc.gov/flu/prevent/how-fluvaccine-made.htm https://www.cdc.gov/flu/prevent/how-fluvaccine-made.htm https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4947948/#irv12383-bib-0003 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4947948/#irv123...