Figure 8.

Geographical distribution of isolates displaying codons under positive selection. A constellation plot is shown, depicting the results of a hierarchical cluster analysis based on the latitude and the longitude coordinates where different isolates were collected. Red, green, and purple dots denote isolates belonging to genetic groups 1, 3, and 4, respectively. Different geographical zones determined by ANOVA are indicated. Different codons under positive selection were highlighted next to specific dots to see potential associations between codons at positive selection and their presentation in specific geographical zones. The numbers next to the dots correspond to specific counties and cities in Colorado.