Figure 2. A) Spatial distribution of 56 places of tularemia transmission in Ljusdal, Sweden, 1995–2005, overlaid on a map with color-coded demographic data based on residential addresses. B) Disease cluster in an area of 25 km2 along the Ljusnan River in Ljusdal. Reported places of disease transmission and corresponding bacterial genotypes are shown. The 33 Francisella tularensis isolates belong to genetic group 1e and are of genotype ID 15 (red) or genotype ID 16 (black). Place of disease transmission was reported to be certain (circle), probable (square), or possible (diamond); patient residency was used when transmission data was unavailable (triangle).