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a substance used to stimulate the production of antibodies and provide immunity against one or several diseases, prepared from the causative agent of a disease, its products, or a synthetic...

I had a "mild" case of shingles 20 years ago. Believe me you don't want to get it. The itching is so bad you'll be thinking suicide.

I got the Pfizer Booster yesterday. I originally got the Moderna and the side effects were minimal. Not so this time. I have seriously bad body aches and headaches. I'm pretty much bedridden all day....