How safe is influenza immunisation?

How safe is influenza immunisation?

Answer: 

The vaccine cannot give you influenza as it only contains fragments of the virus. The vaccine stimulates the immune system to make cells that protect against circulating viruses. Most people have no reaction to the vaccine. Occasionally the site where the vaccination was given is red or sore for a day or two.  Some people may feel unwell for a day or two. These are normal responses to the immunisation.