The study aims to demonstrate that the "thrifty antibiotic strategy" applied to MS or SCI patients with asymptomatic bacteriuria prior to BoNTA intravesical injections does not increase the rate of symptomatic post-injection UTIs compared to the current peri-operative antibiotic strategy. Patients included in the study will be randomized in two balanced-parallel groups, 4 days (+/- 2 days) before intra-vesical BoNTA injections. Group 1: Experimental group: "Sparing antibiotic strategy" No antibiotic therapy will be administered during the peri-operative period. Group 2: Control group: Recommendations - Peri-operative antibiotic strategy An antibiotic therapy will be administered during the peri-operative period. The antibiotic will be selected according to the type of bacteria isolated and the antibiotic susceptibility testing, and started two days before and pursued until two days following intra-vesical BoNTA injections. The main objective is to demonstrate the non-inferiority of "antibiotic saving strategy" compared to peri-operative antibiotic strategy (current recommendations) for occurrence of symptomatic UTI after intra-vesical BoNTA injections in the management of asymptomatic bacteriuria (AB) among multiple sclerosis (MS) and spinal cord injured (SCI) patients undergoing clean intermittent self-catheterization (CISC).
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Rate of patients with symptomatic UTI occurring within the 6 weeks following the injections.
Timeframe: During the 6 weeks following the injections