持续性少精症和死精症的4名病人的输精管中精子严重退化。但在检查中发现睾丸中精子超微结构正常,说明精子退化和死亡是发生在通过附睾或储存于附睾中时,或二者兼而有之或在排精时与精浆混和在一起所致。正常供精者的精浆没有发现具有毒素。3名病人经常排精,每天两次射精,连续4～5天, Sperms were severely degenerated in the vas deferens of 4 patients with persistent oligozoospermia and terminally ill. But in the test found that testicular ultrastructure of normal sperm, indicating that sperm degeneration and death occurs through the epididymis or stored in the epididymis, or both, or in combination with the essence of the refined semen . No seminal plasma from normal donors was found to have toxins. 3 patients often row fine, ejaculation twice daily, for 4 to 5 days,