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Asymptomatic bacteriuria (ABU), established by intravesical inoculation of E.coli 83972, is protective in patients with recurrent UTI. In an RCT cross-over study, two patients developed three symptomatic UTI episodes while carrying E.coli 83972. This study examined if a reacquisition of virulence by symptom isolates may account for the switch from ABU to symptomatic UTI.
