quoting Diego:
Some people developed Guillain-Barre syndrome. So they are looking now for other derivatives that don't cause these problems.

Ph my! You dont want to go there! My cousin developed GB syndrome like overnight. Just woke up one morning and couldn't move or breathe on his own. He's been in and out of the hospital and in a LRC facility for over a year. This is why they dropped this study like a hot potato!

Peggy