just an fyi for those that remain confused about the flu shot
symptoms commonly associated with an infection such as fever, chills, runny nose, cough, and congestion are a manifestation of your immune system responding to antigen. antigen is anything identified foreign in you body which can be anything from pollen, virus, vaccine, bacteria, parasite, etc. the response will vary widely depending on the antigen
the split virus vaccine flu shot consists of chopped up viral parts (antigen) that will hopefully illicit an immunologic memory "response" that will confer immunity (your immune system will be able to eliminate the flu virus before it has a chance to replicate to a significant amount) if you are later exposed to actual flu virus.
I put response in quotations so as to refer back to the first paragraph so people don't confuse the vaccine response to having an actual infection (no viral replication). the flu shot does not contain any whole virus, there is no viral replication involved. It is designed to confer immunity but have a mild response.
Just as you do not have an infection when you get seasonal allergies, you do not have an infection when your body reacts to the flu shot, it is just your body getting in some practice before the big game