G. mellonella killing by A. baumannii strains.

aThe LD50 values are expressed in CFU and were calculated as described in Materials and Methods after 24, 48 and 72 h of infection with A. baumannii cells. Values are the mean (± SEM) of at least three independent experiments and were inferred from a regression curve calculated from at least six different infecting inocula for each experiments.bSince SDF causes insufficient killing of larvae for experimental determination of the LD50 even at the highest infecting dose (i.e. 4×107 CFU/larva), the reported LD50 is a theoretical estimate generated by GraphPad Prism.cThe difference between the LD50 values of SDF and those of clinical strains is statistically significant (P