Moreover, the urine dipstick test have been evaluated in laboratories. But their interpretation in current practice might not be so easy: in particular, the nitrite detection depends on the bacterial concentration. The nitrite detection, produced in enterobacteriaceae related infections might have therapeutical consequences: trométamol-fosfomycine is almost constantly active on enterobacteriaceae, but ineffective on staphylococci. Knowing the increasing prevalence of fluoroquinolone-resistant enterobacteriaceae, the use of fosfomycin in nitrite positive uncomplicated cystitis might preserve the susceptibility of fluoroquinolones during pyelonephritis.