FIG 1.

Genetic structure of 411 C. jejuni isolates from chicken and ruminants in different countries. A phylogenetic tree was constructed from 1,810 genes found in four reference strains of C. jejuni (NCTC11168, 81-176, 81116, and M1) through an approximation of the maximum likelihood algorithm using FastTree2, and visualized using MEGA6. The bar represents the number of substitutions per site. The color of the circle indicates the original host of the isolates, and the kind of circle indicates the country of origin. Isolates from chicken are shown in yellow and those from ruminants in blue. Worldwide isolates are represented by empty (white) circles, and French isolates are represented by filled-in circles. Numeric labels correspond to clonal complexes (CC) or sequence type (ST) of chicken and cattle isolates.