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High-risk zones
MS is most common in northern industrialized countries. The disorder, caused when one's own body triggers an attack on nerve coatings, might be limited in less developed tropical countries because parasites found there tone down such strong immune reactions. Relative rankings derived from a calculation that measures MS burden in lost years of healthy life due to disability or premature death. Based on 2004 data.
Credit: Source: WHO 2009, Geoatlas/Graphi-ogre, adapted by T. Dubé
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