Only a tiny proportion of people develop m s, nor point two % in the united king for example. This creates a conundrum for researches. How can you prove that a near ubiquitous virus causes an auto immune disease in an unlucky few? Scario's epidemeological approach was to track the m s and e b v status of military recruits using medical records and blood serum samples. The team showed all but one had contracted e b v by the time of their m s diagnosis, an infection rate of 97%. By contrast, the infection rate in controls who did not develop m s,. was 50 even %. Those individuals who went on to develop m s had higher levels of neuro degener