vaccines are given to millions of people every year. some people will have adverse health events that occur coincidentally after vaccination. for example an adverse event of an upper respiratory infection after the flu shot may cause a person to believe that she got the flu from taking the flu shot. however the flu shot contains inactivated (killed) flu virus and therefore it cannot cause the flu. an adverse event of a sore arm at the injection site after receiving a vaccination is an example that is likely to be caused by the vaccination.
can you give an example of an adverse event following a vaccine?