Samuel M I, Taylor C
Caldecot Centre, King's College Hospital NHS Foundation Trust, London, UK.
Int J STD AIDS. 2010 Jul;21(7):524-5. doi: 10.1258/ijsa.2010.010029.
A 56-year-old man presented complaining of urinary frequency, passing urine eight times per day, urethral irritation and dysuria. Investigations showed no evidence of urinary tract infection or sexually transmitted infections. Three months later he presented, again complaining of increased urinary frequency and urethral irritation. He brought with him a urine specimen containing a small 'worm', 2 mm in length, identified as a drain fly (or moth fly) larva, of the genus Psychoda (dipterous flies). Psychoda lay eggs in organically polluted water such as sewage plants, sink drains or on decaying vegetables and fruits. Urogenital myiasis may arise from hatching of larvae near the urethral opening and ascending migration along the urethra with consequent urethritis. Following larval identification, ivermectin was prescribed and the man's symptoms improved after six weeks.
一名56岁男性前来就诊，主诉尿频，每天排尿8次，伴有尿道刺激和排尿困难。检查未发现尿路感染或性传播感染的证据。三个月后他再次就诊，仍主诉尿频加重和尿道刺激。他带来一份尿液标本，其中有一条2毫米长的小“虫子”，经鉴定为毛蠓属（双翅目蝇类）的下水道蝇（或蛾蠓）幼虫。毛蠓在有机污染的水中产卵，如污水处理厂、水槽排水口或腐烂的蔬菜和水果上。泌尿生殖系统蝇蛆病可能是由于幼虫在尿道开口附近孵化，并沿尿道上行迁移，继而引发尿道炎。幼虫鉴定后，给予伊维菌素治疗，六周后该男子症状改善。
