Hello there, after reading a lot of stories from people with me I recognized that a certain percentage travelled to Asia and experience either food poisoning or another illness. However I thought that there could be another reason for this kind of travel to influence your immune system. Vaccines. I got 4 vaccines at once before my trip. Maybe this could be one reason why people come down with ME later on in their life? I have a lot of time to think about all kinds of stuff, so please excuse if this a stupid theory.