SMOX and infection: Notably, infectionssupplemented with medium and high concentrations of gallium (corresponding to theintermediate gallium concentration used in the in vitro assays, see‘Methodology’ section) were significantly less virulent (z = 4.96and 2.39, P < 0.05 in both cases) than infections withPAO1ΔpvdD, a mutant defective for pyoverdine production thatitself showed attenuated virulence versus PAO1 (z = 3.49,P < 0.001).