@EpsilonDelta I think many elderly people do not have a strong immune response to the shot. First one was fine for me, aside from a very sore arm. I exercised after the second shot, got hit about 12-13 hours later with some pretty rough side effects. Fever/chills/fatigue, muscle aches. Arm pain was very low in comparison to last time. I was 100% after about 3 days, the first 36 hours being the worst. Rest up, drink water and take tylenol/advil mate.