Figure 5From: Azithromycin effectiveness against intracellular infections of FrancisellaAz inhibition of intracellular F. novicida mutants. A) J774A.1 and B) A549 cells were infected with various mutants at an MOI 500. At 22 hours, the number of CFUs/ml recovered from F. novicida multidrug efflux mutants ftlC, tolC, acrA, and acrB and LPS O-antigen mutant wbtA decreased as Az concentrations increased and was near 0 CFU/ml at 35 μg/ml Az (p-value < 0.005 for all Az treatments compared to 0 μg/ml Az for each mutant). The recovery of mutant strains after Az treatments were significantly different from the wild-type F. novicida with a p-value < 0.05 (1.76 × 105 ± 6.36 × 103 CFU/ml in J774A.1 at 0 μg/ml Az which decreased to 0 CFU/ml at 5 μg/ml Az and 1.80 × 105 ± 1.41 × 104 CFU/ml in A549 cells at 0 μg/ml Az which decreased to 0 CFU/ml at 25 μg/ml Az). J774A.1 cells had higher bacterial counts than A549 cells.Back to article page