Then there is needle aspiration. Whether the needle injects the poison in to muscle tissue or in to a blood vessel.
Dr. John Campbell: Needle Aspiration
Then there is the highly variable differences in human immune systems and how they react to a pathogen. A strong response to the spike protean may be more deadly than a weak response if a weak response is a fever and a strong response is your heart stops.
First jab had no reaction at all. The second jab (required for full vaccination certificate) caused me feeling very tired next day. No fever but felt like I should lay down on bed all day. Next day after that I was back to normal. 6 months later I had a booster. There was again no noticeable reaction.
So I am guessing mRNA stuff has different effects on each individual. A year later I got exposed to covid in a hospital, and felt extremely tired with dry cough. I used the home test kit and it said positive for covid. I laid down in bed all day, with a blanket on because I had the chills. On the next day I woke up feeling completely normal. Did the home the test again, and it said no covid.