Clinical trial results will be necessary to confirm that novel H1N1 and seasonal vaccine will be safe and effective if given at the same time. We expect the seasonal vaccine to be available earlier than the H1N1 vaccine. The usual seasonal influenza viruses are still expected to cause illness this fall and winter. Individuals are encouraged to get their seasonal flu vaccine as soon as it is available.

Source: CDC H1N1 Flu | H1N1 Flu and You