Tick-borne encephalitis.
D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D002675:Child, Preschool; D004675:Encephalitis, Tick-Borne / Q000453:epidemiology* / Q000517:prevention & control; D006801:Humans; D015994:Incidence; D007223:Infant; D007844:Latvia / Q000453:epidemiology; D008875:Middle Aged; D012621:Seasons; D013548:Sweden / Q000453:epidemiology; D014611:Vaccination