Gert E. Olsson*†
, Fredrik Dalerum*1
, Birger Hörnfeldt†, Fredrik Elgh†, Thomas R. Palo*2
, Per Juto†, and Clas Ahlm†
Figure 2. Quarterly incidence of reported nephropathia epidemica cases within respective counties of the northern region from 1991 to 2001, as represented by lines; bars represent annual autumn bank vole–trapping indices.