No, you cant get flu from the shot. It is a killed virus for H1N1 as well as the seasonal flu preparation and does not cause illness. You can be incubating a virus or flu at the time you received the vaccine which will not stop and incubating illness however.
Wayne Yankus, MD, FAAP
expert panelist: pediatrics
You can't get the flu from the flu vaccine, as it contains a dead virus that cannot divide. We get sick with the flu after catching a live virus that multiplies in our bodies. That's what makes us sick. However, after receiving the flu vaccine, it takes approximately 2 weeks to develop full immunity against the flu. Therefore, there is a chance of getting the flu shortly after receiving the vaccine if you get exposed to a live virus.