SOC mentioned in another thread that she and her daughter came down with the same very sudden onset flu-like illness that began their ME/CFS. When mine started, I went to bed feeling fine and woke up ill, then rapidly became more ill. Another person who ordered the same thing for dinner the night before also became very ill. I do not know how soon he became ill; I think within 36 hours. This would require such a short incubation period that I have to admit that it could have been just a coincidence. I am wondering how many others people with flu-like onset ME/CFS has a very rapid onset and if there is any significance to that.