Fig. 2.

The process of highly variable core gene screening and the comparison of typing resolution between traditional MLST and the set of selected core genes. (A) The resolution of the mtlA, aer and seven traditional housekeeping genes. (B) The process of the highly variable gene screening. (C) Venn diagram depicting strains that can be separated by traditional MLST, the sole mtlA gene and mtlA/aer. The numbers in each shape represent the number of strains that are unique to this typing marker and the numbers in the overlapping region are the number of strains common to the corresponding typing markers.