Does the vaccine have any side effects?

Serious adverse reactions to the influenza vaccine are rare, with most common reactions being local redness and swelling at the injection site.

Other mild symptoms including headache, mild fever and sore muscles may occur in a very small percentage of people vaccinated, but are limited to 24-48 hours duration. Allergic reactions may occur in people with a severe egg allergy and such people should not receive the influenza vaccine.