03-01-2017, 09:52 PM
Just because you had a flu shot, it doesn't mean that you can't get the flu. It's not 100% effective, it just improves your chances of avoiding it.
https://www.cdc.gov/flu/about/qa/vaccineeffect.htm
https://www.cdc.gov/flu/about/qa/vaccineeffect.htm
vaccine reduces the risk of flu illness by about 50% to 60% among the overall population during seasons when most circulating flu viruses are like the vaccine viruses.