泌尿系感染是指由多种病原体(细菌、病毒、支原体、衣原体、寄生虫等)侵入泌尿系统所引起的泌尿系感染性疾病。此病在小儿尤其是婴幼儿时期很常见,感染可累及泌尿系各部位,例如可以引起尿道炎、膀胱炎、肾盂肾炎等,但是由于临床上不易确定具体感染部位,因此统称为泌尿系感染。 Urinary tract infection is caused by a variety of pathogens (bacteria, viruses, mycoplasma, chlamydia, parasites, etc.) into the urinary tract caused by urinary tract infections. The disease is very common in infancy, especially infants and young children. Infection can affect various parts of the urinary tract. For example, it can cause urethritis, cystitis, pyelonephritis and the like. However, it is generally referred to as urinary tract infection because it is not clinically easy to determine the specific site of infection.