[Multi-year changes in the morbidity of tick-borne encephalitis in the Irkutsk region].

Correlation and cluster analysis of data on the number of tick-borne encephalitis cases in the Irkutsk region collected for a 31-year period allowed the authors to distinguish three areas with various morbidity dynamics, physical and geographical conditions and level of land development. Long-term morbidity prognosis is presented.