My wife an I (in our 60s) get a flu shot every year. This year we both had mild flu like symptoms for about two days afterwards. First time that ever happened. Hope it was just some sort of reaction to the shot.
It’s possible that you had a mild reaction to the shot, it’s also possible that you caught a mild case of the flu before the shot gave you full immunity (it generally takes about two weeks after getting the shot to build full immunity) or that you coincidentally caught a common cold.
What are the risks from inactivated influenza vaccine?
A vaccine, like any medicine, could possibly cause serious problems, such as severe allergic reactions. The risk of a vaccine causing serious harm, or death, is extremely small.
Serious problems from inactivated influenza vaccine are very rare. The viruses in inactivated influenza vaccine have been killed, so you cannot get influenza from the vaccine.
Mild Problems
soreness, redness, or swelling where the shot was given
hoarseness; sore, red or itchy eyes; cough
fever
Aches
Headache
Itching
Fatigue
If these problems occur, they usually begin soon after the shot and last 1-2 days.
http://www.cdc.gov/vaccines/vac-gen/side-effects.htm
It was, and it may mean that your immune system is now prepared to fight off the flu bug. I wasn’t too impressed with the young lady who gave me my shot. Hope it took. I’m too old to deal with the flu. :-(