Immediate sterility after vasectomy

A series of 32 males who discontinued all forms of contraception following bilateral vasectomy and irrigation of each vas with 2.5 ml of 1/1000 solution of euflavine, have been followed for one year. During this period in which coitus continued with the same frequency as before vasectomy, no pregnancy has resulted. Semen specimens examined shortly after vasectomy in all subjects showed "moderate" to "many" sperms present in one third of males, and "few" in the remaining two thirds: In all the sperms were non motile.