A positive urine test for nitrite (+) suggests a urinary tract infection, mostly with enterobacteria. The common ones are Escherichia coli and Klebsiella pneumoniae. It is recommended to perform urine culture examination and drug sensitivity test, and select sensitive antibiotics for targeted treatment according to the drug sensitivity results. Positive nitrite (+) is more common in patients with recurrent infections or patients with long-term indwelling urinary catheters, or cystostomy tubes, and is relatively difficult to treat. If there is no condition to do urine culture, broad-spectrum antibiotics, such as ciprofloxacin tablets and levofloxacin tablets, can be selected; for patients with heavy or prolonged infection, intravenous preparations can be used for one course of treatment a week, and for patients with levofloxacin or ciprofloxacin allergy, cephalosporins, such as cefixime capsules for oral use, or intravenous drip cefuroxime sodium injection, can be selected.