Intragametal viral infection of spermatozoa can cause true vertical transmission of viruses through germ cells. Currently, human immunodeficiency virus, hepatitis C viruses, herpes simplex virus, cytomegalovirus, Zika virus have been detected in spermatozoa. The possibility of vertical transmission of human immunodeficiency virus, cytomegalovirus, herpes simplex virus and Zika virus has been proven. Intragametal infection of spermatozoa with viruses of the herpes group leads to abnormalities in the development of the embryo and can cause spontaneous abortions both during natural conception and when using assisted reproductive technologies. The development of adequate methods for diagnosing an intragametal spermatozoa virus infection will make it possible to find out, at least in some patients, the cause of infertility and pregnancy abnormalities and apply appropriate antiviral therapy in preparation for natural conception or the use of assisted reproductive technologies. © 2020 ABC-press Publishing House. All rights reserved.