Hello, The flu vaccine is considered to be very safe. Despite that extensive use has brought up several neurological complaints including cases similar to your daughter s. In such cases the vaccine is not the most likely cause and its implication cannot be proved unless all other causes are excluded. This means that she has to be thoroughly assessed by a neurologist and definitely do the necessary tests (radiological-MRI of the brain and the spinal cord and perhaps also a lumbar puncture - the neurologist should guide the investigation) before attributing anything to the vaccine. Various disorders of the spinal cord or systemic degenerative disorders may have caused this. I can t either confirm or exclude the vaccine s role in it. She s right to be worried as neurological disorders can be very annoying and the available treatments usually are far from perfect but the most important thing for her right now is to get a well documented diagnosis. The clear brain scan is good news. She needs more tests though. Hope I have answered your query. Let me know if I can assist you further.