Viral Impact on Male Fertility: Current Insights and Implications for SARS-CoV-2

Male infertility is a global health concern, contributing to approximately 50% of infertility cases, with viral infections increasingly recognized as significant etiological factors. This comprehensive review explores the role of viruses, including HIV, mumps virus, Zika virus (ZIKV), hepatitis viruses, and SARS-CoV-2, in disrupting male reproductive health. These pathogens can directly infect the male reproductive tract, compromise the integrity of the blood–testis barrier, and impair critical sperm parameters such as motility, morphology, and DNA integrity. Mechanisms underlying viral-induced male infertility include direct testicular cell infection, immune-mediated inflammation, oxidative stress, epigenetic modifications, and hormonal dysregulation. For instance, the mumps virus is known to cause orchitis, leading to testicular atrophy, while ZIKV persists in semen, impairing sperm function. SARS-CoV-2, the causative agent of COVID-19, has emerged as a significant concern due to its ability to infect testicular cells, induce systemic inflammation, and disrupt the hypothalamic–pituitary–gonadal axis, potentially leading to long-term fertility complications. The review emphasizes the importance of early diagnosis and targeted management of viral infections to mitigate their impact on male fertility. It also discusses the implications for assisted reproductive technologies, particularly in cases where viruses persist in semen, necessitating rigorous screening and viral inactivation protocols. Emerging therapeutic strategies, including antioxidant therapies, immunomodulatory agents, and stem cell-based interventions, offer promising avenues for preserving fertility in affected individuals. Additionally, the role of vaccination in preventing viral-induced reproductive dysfunction is highlighted, underscoring the need for widespread immunization against viruses such as mumps and human papillomavirus. This review calls for increased awareness among healthcare providers, routine screening for viral pathogens in men presenting with infertility, and further research into the long-term effects of viral infections on male reproductive health. By elucidating the complex interplay between viruses and male fertility, this work aims to inform clinical practice, guide future research, and improve outcomes for men affected by viral-induced infertility.