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Drink plenty of oral fluids- Fluids decreases the growth of bacteria by flushing out your urinary tract.
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Vitamin c supplements may helpful as they also deter bacterial growth by making your urine more acidic.
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To prevent the spread of bacteria from rectum to urinary tract; always clean the area from front to back after having bowel movement.
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To prevent the spread of bacteria during sex cleanse your genitals before having sex & if possible, urinate after intercourse to flush bacteria from your urinary tract.
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Talk to your doctor for more advice on this.