Hantavirus surveillance for Finland.
Puumala virus is endemic across Finland with the bank vole as reservoir. Disease is generally mild (CFR <1%) but case counts are high enough to make Finland the most active hantavirus surveillance country in Europe.
Active surveillance. Finland reports the highest Puumala virus case count in Europe, typically 1,000-3,000 confirmed per year. Cases follow bank vole population cycles tied to seed crop years.
The dominant hantavirus species in Finland is Puumala. See the strain reference for detail on transmission, mortality and reservoir biology.