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The size of the circle is proportional to the number of strains and the color indicates the diverse serogroup. The digits on the lines between two circles represent the different number of two STs. The shading surrounding the STs simply links STs within the same clonal complex (CCs). Ten CCs including (CC143, CC105, CC37, CC107, CC214, CC106, CC17, CC1, CC216 and CC224) were identified.
