Fig 2.

Adherence characteristics of strains ATCC 17978 and 17978hm. (A) Pellicles of A. baumannii strains ATCC 17978 and 17978hm were examined after incubation for 72 h at 25°C, and statistically significant (P < 0.001; two-tailed Student's t test) differences are indicated by asterisks (**, P < 0.05; ***, P < 0.001). Experiments were performed at least three times, and error bars represent the standard deviations. (B) The CFU in log₁₀ values of A. baumannii ATCC 17978, 17978hm, 17978hm (pWH1266), and 17978hm (pWH0268), recovered from a washed A549 cell culture after incubation for 4 h, were enumerated. Significant differences between ATCC 17978 and 17978hm (P < 0.05), and 17978hm(pWH1266) and 17978hm(pWH0268) (P < 0.005) were observed using a two-tailed Student t test and are indicated by asterisks (*, P < 0.005; **, P < 0.05). Error bars show the standard errors of the means.