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(a) Kurtzke's global MS prevalence scale
| Classification | Prevalence rate (per 100,000) | Countries |
|---|---|---|
| High | 30–80 | Most of Europe, most of United States, Canada, New Zealand, Israel, Cyprus, and south-eastern Australia |
|
| ||
| Medium | 5–25 | Southern Europe, most of Australia, most of Russia from the Urals into Siberia as well as the Ukraine, South Africa, possibly much of the Caribbean region, and South America |
|
| ||
| Low | <5 | Asia, most of Africa, and South America (Venezuela and Colombia) |
