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Vivi Li
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Okeleji, O.L.;  Ajayi, L.O.;  Odeyemi, A.N.;  Amos, V.;  Ajayi, H.O.;  Akinyemi, A.O.;  Nzekwe, C.S.;  Adeyemi, J.W.;  Ajayi, A.F. Viral Zoonotic Diseases and Male Reproduction. Encyclopedia. Available online: https://encyclopedia.pub/entry/38948 (accessed on 15 November 2024).
Okeleji OL,  Ajayi LO,  Odeyemi AN,  Amos V,  Ajayi HO,  Akinyemi AO, et al. Viral Zoonotic Diseases and Male Reproduction. Encyclopedia. Available at: https://encyclopedia.pub/entry/38948. Accessed November 15, 2024.
Okeleji, Olabisi Lateef, Lydia Oluwatoyin Ajayi, Aduragbemi Noah Odeyemi, Victor Amos, Hezekiah Oluwatobi Ajayi, Amos Olalekan Akinyemi, Chibueze Samuel Nzekwe, Johnson Wale Adeyemi, Ayodeji Folorunsho Ajayi. "Viral Zoonotic Diseases and Male Reproduction" Encyclopedia, https://encyclopedia.pub/entry/38948 (accessed November 15, 2024).
Okeleji, O.L.,  Ajayi, L.O.,  Odeyemi, A.N.,  Amos, V.,  Ajayi, H.O.,  Akinyemi, A.O.,  Nzekwe, C.S.,  Adeyemi, J.W., & Ajayi, A.F. (2022, December 19). Viral Zoonotic Diseases and Male Reproduction. In Encyclopedia. https://encyclopedia.pub/entry/38948
Okeleji, Olabisi Lateef, et al. "Viral Zoonotic Diseases and Male Reproduction." Encyclopedia. Web. 19 December, 2022.
Viral Zoonotic Diseases and Male Reproduction
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This entry is adapted from the peer-reviewed paper 10.3390/zoonoticdis2040023

Zoonotic diseases occur as a result of human interactions with animals with the inadvertent transmission of pathogens from one to another. Zoonoses remain a major cause of morbidity and mortality among human populations, as they have been a source of pandemics in human history. Viral zoonoses account for a significant percentage of pathogens of zoonotic sources, posing a huge risk to men’s general health and fertility. Evidence from reviewed articles showed that viral zoonotic diseases elicit an immune reaction that induces inflammatory mediators and impairs testicular functions such as spermatogenesis and steroidogenesis, leading to abnormal semen parameters that lead to subfertility/infertility. Although most zoonotic viruses linger in semen long after recovery, their presence in semen does not directly translate to sexual transmission. 

fertility public health spermatogenesis steroidogenesis zoonoses

1. Introduction

Zoonotic diseases are infections that occur as a result of human interactions with animals and the environment [1]. These diseases are transmissible from animals to humans or from humans to animals [2]. Human–animal interactions occur mostly through human contact with animal-origin foods, domestic animals, pets, aquatic animals, edible insects and foodborne pathogens [3].
Animal-borne pathogens constitute about 61% of all human disease-causing organisms, and three out of every four new emerging infectious diseases arise from animal sources [2][4]. Zoonotic diseases disrupt human activities and cause increased morbidity and mortality among the human population, being responsible for about 2.4 billion cases of illness and about 2.7 million deaths in low- and middle-income countries [5]. The impact of zoonotic diseases on human health is evident from previous outbreaks that have plagued the human race on a global scale. To mention a few, the COVID-19 outbreak was first reported in Wuhan, China, and paralyzed human activities in 2020 with an ongoing negative effect on the world economy. Other notable zoonotic disease outbreaks include the Ebola virus outbreak in 2013, the Russian flu in 1977, the Spanish flu in 1918, the Middle East Respiratory Syndrome Coronavirus (MERS-CoV) in 2012, Human Immunodeficiency virus in 1981 and Swine flu in 2009 [6]. Exposure to zoonotic pathogens disrupts human physiology with short- or long-term effects on body organ functions.
Microbial infection from various sources is a major cause of infertility. Many microbial pathogens have been previously ascribed as a cause of different female reproductive dysfunctions, which might cause infertility or delayed fertility. Infection is considered to be a contributing factor in male infertility when it affects the urogenital tract and promotes inflammatory responses. Infectious agents disrupt the internal milieu of the male reproductive system, leading to numerous pathologies, such as orchitis, epididymitis, prostatitis and urethritis. Genital tract infection accounts for about 15% of male infertility cases by disrupting spermatogenesis at different stages [7][8]. Pathogens cause male reproductive dysfunction by inflicting direct harm on the reproductive tissues or activating an immunological response and the release of inflammatory cytokines, which leads to oxidative stress and consequent oxidative damage [9]. In addition, infections in the male reproductive tract may be detrimental to sperm quality [7] or cause testicular dysfunction through the disintegration of its physical barrier and leukocyte infiltration [10].

2. Effects of Viral Zoonotic Diseases on Male Reproduction

2.1. Effect of Influenza on Male Fertility

A number of studies have shown that influenza alters sperm parameters [11][12][13]. Interestingly, the virus has not been previously seen in semen, nor has the viral receptor been reportedly expressed in the human genital system [13]. However, experimental models studying the effect of human influenza on male fertility suggest that the virus can induce chromosomal aberrations in spermatozoa [14][15].
A study that evaluated the effects of an influenza outbreak on sperm production in Boaz reported that influenza caused a decrease in sperm production when compared to pre-outbreak values, which was later reversed after a period of observation [16]. Similarly, Sergerie et al. reported that patients with febrile episodes had abnormal semen parameters and sperm DNA integrity, which could result in future infertility [17]. Furthermore, Evenson et al. reported that influenza and the febrile condition could have latent effects on the sperm chromatin structure and might lead to the transient release of abnormal sperm [12].

2.2. COVID-19 and Male Fertility

SARS-CoV-2 directly infects the cells by coupling with angiotensin-converting enzyme 2 (ACE-2) receptors and transmembrane serine protease 2 (TMPRSS2) [18]. ACE-2 is present on almost all testicular cells. The results of a genotype tissue expression project showed that the tissue expression of ACE2 is highest in the testicles, while TMPRSS2 is mostly expressed in the prostate [19]. A report from single-cell RNA sequencing data demonstrates that the testes lack the co-expression of ACE2/TMPRSS2 enzymes [20]. The lack of the co-expression of these two enzymes in the male gonads suggests that SARS-CoV-2 might not be able to infect gonad cells. However, there is high expression of ACE2 in the genito-urinary tissues, which could contribute to the infectivity of SARS-CoV-2 in the reproductive tissues. It has been previously reported that the SARS coronavirus could have an impact on male gonads. Hence, SARS-CoV-2 is likely to affect testicular tissue, semen parameters and male fertility [21].
Before the COVID-19 outbreak in December 2019, there were two previous outbreaks of coronaviruses, and since then, the possible involvement of the testes and genito-urinary tract has been studied [22]. A study involving six men who died of COVID-19 in China reported that these patients had orchitis, germ cell destruction, very low spermatozoa in seminiferous tubules, basement membrane thickening, leukocyte infiltration and vascular congestion, which suggests systemic complications [22]. Another study in Brazil on the first autopsies of COVID-19 patients reported that orchitis with fibrin microthrombi was a common feature in the post-mortem analysis of testicular samples. Similarly, a study of 12 deceased COVID-19 patients demonstrated a reduced Leydig cell count, mild infiltration of leukocytes and significant seminiferous cellular injury [23].
From the results of the studies conducted, one can suggest that SARS-CoV-2 reaches the testis through the blood and affects the Leydig and Sertoli cells, thereby altering the steroidogenic pathway and also recruiting immune cells, which might promote inflammatory markers and promote orchitis. One can also hypothesize that SARS-CoV-2 may infect the testes directly, thereby inducing a cytokine storm, as is the case in other viral infections [24][25][26].

2.3. Zika Virus and Infertility

Zika virus is primarily spread through mosquito bites (Aedes species), but it can also spread through sex. Zika can stay in the semen and may be passed to a partner (and the fetus) for months after infection, even if there are no symptoms [27]. Reports from recent studies show that Zika virus RNA persists in the semen and also in the male and female reproductive tracts, which suggests the possibility of sexual transmission [28]. The sexual transmission of Zika virus was first reported in 2011 and supported by many occurrences of many other cases [29]. In patients previously infected with Zika virus, viral RNA has been reported to persist in their semen six months post-infection [30]. This has been supported by previous studies that reported the presence of Zika virus RNA in symptomatic and previously infected asymptomatic patients [31]. Similarly, Zika virus has been shown to remain in the semen and sperm fraction needed for assisted reproduction for up to 112 days post-infection [32]. All of these findings provide evidence that men previously infected with Zika virus could be a reservoir of infection through sexual transmission [33].

2.4. Lassa Virus and Male Fertility

With the increasing prevalence of Lassa virus disease, there are concerns about its potential to cause transgenerational defects due to its persistence in recovered patients or result in subfertility/infertility among survivors. There is evidence that suggests that the viral antigen perpetuates in the epithelial cells of breasts, theca and stromal cells in ovaries and trophoblastic cells in the placenta and has been associated with some endocrine tissues that might affect fertility in females.
In males, there is evidence that suggests that Lassa virus is excreted from the semen up to three months after infection [34][35], suggesting the possibility of the sexual transmission of the disease among previously infected persons [35]. This occurrence was similarly reported among two patients previously treated with a combination of ribavirin and favipiravir with prolonged detectable viral RNA in the blood and semen, which suggests the possibility of the sexual transmission of Lassa virus after treatment [36]. Indeed, another study reported that viral RNA persists in the semen of patients after viremia has been resolved, and this was accompanied by epididymitis [37]. This suggests that the male reproductive tract is one site of antigen persistence after Lassa virus infection. This noted persistence might be a result of memory T cells formed after an elevated acute response of T cells to Lassa virus [37]. Hence, further studies should be geared towards modulating the role of T cells in Lassa virus disease in order to lessen its systemic and prolonged deleterious effects.

2.5. Crimean–Congo Hemorrhagic Fever and Human Reproductive System

Crimean–Congo hemorrhagic fever virus (CCHFV) has not been proven to be present in the human reproductive system but has been identified in the testes and ovaries of a non-primate. A study of three infected monkeys shows that these monkeys had features of unilateral inflammation of the testis and the presence of the Crimean–Congo hemorrhagic fever virus antigen and RNA in these animals. This is the first notable evidence reporting the persistence of this virus in the male genital tract, which suggests the possibility of sexual transmission [38].

2.6. Effects of Ebola Virus on Male Fertility

Ebola virus (EBOV) ribonucleic acid (RNA) has been previously detected and noted to persist for up to 290 days among previously hospitalized Ebola patients. In addition, semen from Ebola patients was shown to carry Ebola virus 70 days after the onset of the illness. A similar report on the persistence of Ebola in semen reported that the virus remained in the semen 82 days after a previous Ebola virus disease (EVD) outbreak [39]. The infection of the testes by EBOV probably takes place via viremia during acute Ebola virus disease. The viral antigen was detected in the seminiferous tubules from a certain Ebola virus disease case [40]. In experimental animal models of Ebola virus infection, it was noted that particles of Ebola virus were present within the endothelium, monocytes and interstitial cells of the testes of the infected animals [41]. Ebola virus can be actively spread for longer periods through its release from the immune response of the testes. Hence, the World Health Organization (WHO) suggests that Ebola virus patients abstain from sex for three months post-recovery or use a condom within this period to prevent the spread of the virus [42]. 

2.7. Monkeypox Virus

Monkeypox virus is a re-emerging virus with pockets of outbreaks presently in about 30 countries of the world. There is evidence that suggests its presence and effect on the male reproductive system. It has been previously reported that monkeypox virus can induce direct cytopathic effects on and damage to the testes and other parts of the human reproductive tract, causing interstitial orchitis and seminiferous tubule degeneration [43][44]. There are also growing concerns that monkeypox virus could be sexually transmitted because of its persistence in semen. Antinori et al. [45] reported the presence of the virus in human male semen. Further, Bragazzi and colleagues pointed out a correlation between sexual practices and clinical signs of monkeypox virus, noting that men who have sex with men, practice unsafe sex and have a prior history of sexually transmitted diseases are more susceptible to monkeypox infection. Heskin et al. reported the first case of the possible sexual transmission of monkeypox among patients who had no recent travel history but became infected through sexual contact [46]. Noteworthy are characteristic lesions in the ano-genital areas of monkeypox patients, which further suggest the possibility of sexual transmission [47][48].

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Subjects: Primary Health Care
Contributors MDPI registered users' name will be linked to their SciProfiles pages. To register with us, please refer to https://encyclopedia.pub/register :
Olabisi Lateef Okeleji
,
Lydia Oluwatoyin Ajayi
,
Aduragbemi Noah Odeyemi
,
Victor Amos
,
Hezekiah Oluwatobi Ajayi
,
Amos Olalekan Akinyemi
,
Chibueze Samuel Nzekwe
,
Johnson Wale Adeyemi
,
Ayodeji Folorunsho Ajayi
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Revisions: 2 times (View History)
Update Date: 20 Dec 2022
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