In 1992 I got a flu shot. Before the nurse emptied a quarter of the syringe, the injection sight turned as hard as a rock, turned red, got hot and swelled up a good inch. She stopped the injection and I was kept in the Dr's. office for several hours for observation before I could go back to work. Have not had a flu shot since. I also haven't had the flu or a cold since I started doing a shot of fire cider every morning for close to four years.