Table 1. Amplification of fosfomycin resistant mutants in mice treated with the antibiotic.

Strains	FosR mutant/total cfu (treated mice)	FosR mutant/total cfu (untreated mice)	Fold increase in Fos-R
PA14 WT	9.8×105	1.58×106	61.98
mutS::MAR2xT7	1.70×101	2.54×104	666.76

Fold increase values were calculated as the ratio between the median of the proportion of Fos-R mutants/total bacterial counts (figure 2B) of treated and untreated mice.