I sometimes have to use a catheter anyway (mainly for shy bladder syndrome, but a few times I also had urinary
retention from NSAID drugs or something), and I was running low on catheters, so I washed but didn't properly sanitize some of my catheters for several uses. A few days later, I got a fever, and other UTI symptoms. I then went to the doctor and was treated for UTI with antibiotic Macrobid (the urine culture later came back positive for Staph).