Ok I am still able to post.
I don't think I'm allowed to post this on a recent thread as I'm required to do it on a "general debate" thread. However this makes it a thread about a thread so maybe that's not allowed either.
I was recently told on a thread about HPV vaccination that various cases of teenagers collapsing with CFS/fatigue afterwards were impossible to ascribe to the vaccine because there was no physiological mechanism whereby such a regression could occur.
This link about CFS and the immune system explains how it is possible. I'll link the other sites about vaccination and B lymphocytes in a minute.
Just be warned that quoting and requoting posts and being "challenging" are apparently "not the mumsnet way". So I suppose one could have a debate but not entirely sure how.