You heard wrong. The side effects are not expected to be any different from the seasonal flu vaccine. Similarly, GBS is not expected to be an issue, in the same way it is not an issue with the seasonal flu vaccine.
The nasal vaccine will be a live, but weakened form of the virus. The shot, like the seasonal vaccine, will be the dead virus. There still isn’t much information known about the potential side effects of the vaccine, however the CDC has stated that the risks of not getting the vaccine is worse then any possible risks of getting the vaccine.
Good INFO for the BRAIN