Super informative. I myself never liked getting the flu shot. I may have gotten it a couple times. And every time I did get it I would get sick. Since then I've never gotten sick. No flu, nothing. Allergies don't count! lol
I will definitely be sharing and up voting this. I never know all of what goes into a flu shot. So thank you for sharing this with the steemit community. :)
Thank you and You are very welcome!