Microorganisms in semen used for artificial insemination

Area of Science:

• Reproductive Biology
• Microbiology
• Cryopreservation Science

Background:

• Donor semen can harbor indigenous microorganisms and sexually transmitted pathogens.
• Cryopreservation of semen is essential for assisted reproductive technologies.
• Assessing the impact of cryopreservation extenders on pathogen viability is crucial for semen safety.

Purpose of the Study:

• To evaluate the efficacy of cryopreservation media containing egg yolk glycerol with or without erythromycin.
• To determine the survival rates of indigenous microflora and seeded sexually transmitted pathogens in cryopreserved semen.
• To assess the impact of cryopreservation and antimicrobial agents on pathogen inactivation.

Main Methods:

• Donor semen samples were analyzed for microbial content.
• Specific sexually transmitted pathogens (Neisseria gonorrhoeae, Chlamydia trachomatis, herpes simplex virus) were seeded into semen.
• Semen samples were cryopreserved in egg yolk glycerol extender, with and without erythromycin.
• Microbial viability and pathogen survival were assessed post-cryopreservation.

Main Results:

• Indigenous microflora, including Ureaplasma urealyticum, showed resistance to cryopreservation and erythromycin.
• Neisseria gonorrhoeae strains were eliminated by freezing in egg yolk glycerol with erythromycin.
• Chlamydia trachomatis was eradicated by the presence of erythromycin in the cryopreservative.
• Herpes simplex virus survival was not affected by any tested cryopreservation or antimicrobial treatment.

Conclusions:

• Cryopreservation with erythromycin offers a potential method for eliminating specific sexually transmitted bacteria in donor semen.
• Certain pathogens, like Ureaplasma urealyticum and herpes simplex virus, exhibit resistance to current cryopreservation and antimicrobial strategies.
• Further research is needed to develop comprehensive methods for pathogen decontamination in cryopreserved biological samples.