Comparison of the ability of two sperm preparation techniques to remove microbes.

The ability of a new sperm preparation method--self migration in sodium hyaluronate (SH)--to remove microbes from samples was compared to that of the traditional method of centrifugation/swim up (CS). Two 1-ml aliquots were taken from 20 semen samples used for inseminations, and prepared by each of the methods. Samples for culture were taken immediately before wash and at 2 and 24 h after. Microbes were found in all raw semen samples with a mean concentration of 47.8 x 10(3) colony forming units per ml (c.f.u./ml). After preparation and 2 h incubation with and without penicillin, both CS and SH were found greatly to reduce the number of isolates. There were no differences between the ability of the two methods to reduce microbe concentration, although SH recovered more progressive motile spermatozoa than CS (P less than 0.05). When penicillin preparation was omitted, both the CS and SH methods resulted in significantly more isolates after 24 h of incubation. This effect of penicillin preparation was also evident after only 2 h of incubation with CS, but not with SH. No clinical signs of infection were observed among women receiving treatment. We conclude that sperm preparation by self migration in sodium hyaluronate is a simple and safe method to remove microbes and to recover motile spermatozoa.