Volume 9, Number 11—November 2003
Research
Human Hantavirus Infections, Sweden
Figure 5

Figure 5. Spatial distribution of nephropathia epidemica infections during 1991 to 1998 in the northern half of Sweden as suggested by patients confident about their site of virus exposure (n = 862). Sites of virus exposure are represented by red (1998 outbreak) and gray dots (remaining years). Densely built-up areas are represented by yellow squares (8,400 to 71,000 inhabitants). Kernel estimates (bold contours) on spatial clustering of cases represent 95%, 75%, and 50% chances of encountering a case among the 862 samples.