For the nasal spray vaccine, the most common side effects include runny nose or nasal congestion for all ages, sore throats
in adults, and --
in children 2 to 6 years old -- fever.
As with any medical product, unexpected or rare serious adverse events may occur. The FDA is working closely with governmental and nongovernmental organizations to enhance the capacity for adverse event monitoring, information sharing and analysis during and after the 2009 H1N1 vaccination program. In the U.S.