Volume 11, Number 12—December 2005
Synopsis
Francisella tularensis in the United States
Figure 8

Figure 8. Genetic and spatial data of the A.I and A.II subpopulations of Francisella tularensis subsp. tularensis in the United States. A) Ancestral status of these 2 subpopulations is unclear; either could have founded the other, or a third unknown subpopulation could have been the ancestor. B) Highly restricted bacterial-endemic regions could now be breaking down because of human-mediated dispersal of the pathogen across the country. The small circles indicate the spatial distribution of the A.I and A.II isolates, as shown in Figure 6.