Yes, injury from vaccines tell you it's working. You've heard, no pain, no gain. Don't worry if you end up dying. This is a perfectly normal process of recovery. It may sound counterintuitive and unusual. Remember, this is a new technology and you're helping your fellow humans by leading by example. You're also helping doctors by giving them real world experience they've never encountered. So don't be selfish to your brothers and sisters, take another booster today! Don't wait until it's too late!