How do we identify infectious agents that trigger Guillain-Barré syndrome, Fisher syndrome and Bickerstaff brainstem encephalitis?

How do we identify infectious agents that trigger Guillain-Barré syndrome, Fisher syndrome and Bickerstaff brainstem encephalitis?

Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of the Neurological Sciences - Volume 302, Issues 1–2, 15 March 2011, Pages 1-5

Nobuhiro Yuki, Nortina Shahrizaila,