When you mentioned Avonex and difference in your reaction to it, I knew I had recently read a thread on a MS board where some folks where questioning if anybody else was having problems with a specific lot number of Avonex.

I found the thread, but the reaction they were talking about was increased flu like symptoms, but the poster said they hadn't had a reaction for years, but was now experiencing it.

I copied the lot number, the thread was on the braintalk board, just for info sake, it was lot P32034.