On October 24, 2011 I got my first flu shot. On October 26, 2011, 48 hours after the shot, my ptosis started. I had not had any other MG symptoms up to that point. The flu shot was not from a live vaccine. Coincidence or not, I won't be getting another flu shot, ever. I'm assuming MG was already present and would have surfaced at some point, but I believe the flu shot activated it. As I'm not on medications and am symptom free after my thymectomy, my Dr is leaving it up to me.