The Influenza vaccine in "Most" cases is safe. People with severe allergic reactions to eggs should not receive Influenza vaccines, since the vaccine is prepared from influenza grown in eggs. The most common side effect is mild soreness at the injection site. Serious side effects such as such as life-threatening allergic reactions or Guilain-Barre syndrome are rare (fewer than 1to 2 cases per million vaccine recipients).
Although the virus will continue to change and we will continue to try to defeat it, we never will. Just in the past three years two new strains have been discovered but were isolated and wiped out quickly. Maybe next time we won't be so lucky but maybe we will. After all, it's only the flu and humans didn't get this far by worrying about it.
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