Fig. 1

CR-hvKP strain NK01067 exhibits a markedly increased frequency of capsular phase variation in vitro. a Mucoid opaque (M–O) and non-mucoid translucent (NM-T) colony phenotypes on LB agar. b The proportion of NM-T colonies of various clinical hvKP strains after serial passages on LB agar, measured at 0, 24, 48, and 72 h. The experiment was conducted in triplicate independently