Some people developed Guillain-Barre syndrome. So they are looking now for other derivatives that don't cause these problems.[/QUOTE]

Actually, GM1 ganglioside is a very poor antigen and in GB syndrome, the auto-antibodies to GM1 are formed by exposure to GM1 mimics on various bacteria and viruses. The most common cause is C. jejuni.
Larry Holler DVM, PhD *edit*