Thank you both. The numbers seem to be lower than I imagined. Nevertheless, although I did use the word “deadly”, my main point was that there are some real dangers, even if those dangers affect only a tiny number of people. Those who suffered anaphylaxis are fortunate to have gotten treatment in time, or else they very possibly could have died.
Those of us who are are pro-vaccine may have a tendency to ignore these things, because the chances are so very close to zero. My only point is to be honest and realize that there is indeed a very slight chance of bad results.