In the infection group, K14 and K64 serotypes accounted for 69.2% (9/13), followed by K19 serotypes accounting for 23.1% (3/13), and one strain could not be typed; in the colonization group strains, K14 and K64 serotypes accounted for 42.6% (23/41), K19 serotype accounted for 25.9% (14/41), and 8 strains could not be typed. This evidence concerns the gene KRT14 and infection.