Incidence range from 0.5 - 1 per 100,000 population in Armenia, Estonia, Lithuania and Uzbekistan, to 27 - 32 per 100,000 in Russia and Tajikistan.
Case fatality rates range from 2-3% in Russia and Ukraine, to 6-10% in Armenia, Kazakhstan, Moldova and Latvia, and to 17-23% in Azerbaijan, Georgia and Turkmenistan.
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