The Impact of Bacteriospermia on Sperm Survival and DNA Fragmentation in Subfertile Men

Satyanarayan Samantaray¹, Soumya Jal¹, Gopal Krishna Purohit², Sangeeta Chhotaray¹

¹School of Paramedics and Allied Health Sciences, Centurion University of Technology and Management, Odisha.

²Heredity Biosciences, Plot No:818, Mayfair Lagoon Road, Jayadev Vihar, Bhubaneswar, Odisha.

*Corresponding Author E-mail: satyanarayansamantaray544@gmail.com

ABSTRACT:

Bacteriospermia, or the presence of bacteria in the semen, is often overlooked in male subfertility. This review synthesizes research on the impact of bacteriospermia on sperm parameters, particularly sperm survival and DNA fragmentation, in subfertile men. Bacteria, such as Escherichia coli, Enterococcus faecalis, and Staphylococcus aureus, are commonly detected in unexplained infertility. These pathogens induce inflammatory responses in the male reproductive tract, thereby reactive oxygen species levels. Increased ROS levels are linked to reduced sperm motility, decreased viability, and heightened DNA fragmentation, which are all critical factors in male fertility. Quantitative studies have consistently shown that men with bacteriospermia exhibit higher DNA fragmentation indices than those without bacteriospermia. Treatment targeting these infections is correlated with improved sperm quality and reduced DNA fragmentation, highlighting the direct impact of bacteriospermia on sperm health. These findings underscore the need for routine bacteriospermia screening in male subfertility assessments and highlight the potential benefits of antimicrobial therapy. Studies have shown that men with bacteriospermia exhibit up to a 40% increase in the DNA fragmentation index (DFI) and a 30% decrease in sperm motility compared with uninfected men. Future research should include longitudinal cohort studies to establish causal relationships and optimize treatment protocols.

KEYWORDS: Bacteriospermia, Male subfertility, Sperm survival, DNA fragmentation, Reactive oxygen species (ROS), Antimicrobial therapy, Sperm quality.

1. INTRODUCTION TO BACTERIOSPERMIA:

Bacteriospermia, characterized by the occurrence of bacteria in semen, is gaining recognition as a notable factor in male subfertility. The prevalence among subfertile men ranges from 10% to 35%, with variations attributed to diagnostic methods, population characteristics, and underlying health issues^1-2. This condition can be temporary or long-lasting, with bacteria entering from various sources.

Escherichia coli, Enterococcus faecalis, Staphylococcus aureus, and Proteus mirabilis are the most frequently identified bacteria in the semen of subfertile men^3-5. These microorganisms often ascend from the urethra, descend from the bladder, are introduced during sexual contact, or result from inadequate hygiene¹. Moreover, disorders such as chronic prostatitis and epididymitis are commonly linked to bacteriospermia, as these infections weaken natural defenses and enable bacterial movement within the reproductive system^6-7.

While the precise ways in which bacteria impair sperm health remain unclear, several theories have been proposed. It is believed that semen bacteria trigger an inflammatory response, leading to increased levels of reactive oxygen species (ROS). Excessive ROS can harm sperm motility, viability, and integrity by attacking crucial cellular components such as lipids, proteins, and DNA^1,8-9. Prevalence estimates of bacteriospermia among subfertile men range from 10% to 35%, depending on diagnostic techniques and population demographics^1,3.

Some bacteria also exert direct toxic effects or produce harmful substances that damage sperm. For instance, E. coli can decrease sperm motility and viability through the production of hemolysin and other virulence factors that disrupt sperm cell membranes¹⁰. Furthermore, bacterial metabolic byproducts like ammonia and indoles can create an unfavorable environment for sperm, further compromising their function¹¹.

Identifying specific bacterial species and understanding their pathogenic mechanisms is crucial for developing effective diagnostic and treatment approaches, potentially improving management strategies for subfertile men and enhancing reproductive outcomes.

2. Pathophysiology of Bacteriospermial:

Bacteriospermia has emerged as a critical factor in male subfertility, with mechanisms involving inflammation in the male reproductive tract and the resulting oxidative stress (Figure-1).

Figure 1: Bacteriospermia negatively affects sperm quality by reducing motility, altering morphology, and increasing DNA fragmentation. It also induces oxidative stress and immune responses, further compromising sperm function.

2.1 Inflammatory Response Due to Bacteriospermia:

The male reproductive system has natural defences to protect spermatozoa from pathogens, yet the introduction of bacteria can disrupt this balance. Common bacteria associated with bacteriospermia, including Escherichia coli, Staphylococcus aureus, and Enterococcus faecalis, can invade the reproductive tract by ascending infections from the urethra, retrograde movement from the bladder, or external contamination during semen collection^1,12.

Once inside the reproductive tract, these bacteria can adhere to spermatozoa or the epithelial lining of the reproductive organs, triggering an innate immune response. This response involves the recruitment of macrophages and neutrophils to the semen and prostate gland, where they produce inflammatory mediators such as tumor necrosis factor-alpha (TNF-α), interleukin-6 (IL-6), and interleukin-1 beta (IL-1β)¹³. While these cytokines and chemokines are essential for controlling infections, they can also damage the spermatozoa. For example, TNF-α has been shown to reduces sperm motility and induces apoptosis in sperm cells¹⁴.

2.2 Oxidative Stress and Sperm Dysfunction:

In addition to cytokine production, inflammatory cells at infection sites generate reactive oxygen species (ROS) as a part of the body’s defense. Although low levels of ROS are necessary for normal sperm functions, such as capacitation and acrosome reaction, excessive ROS can be harmful¹⁵. When ROS production overwhelms the natural antioxidant defenses in semen, such as superoxide dismutase and catalase, oxidative stress occurs, leading to damage that the body cannot repair adequately.

Oxidative stress is particularly harmful to sperm because of its high polyunsaturated fatty acid content, which makes their membranes highly susceptible to lipid peroxidation. Peroxidation compromises membrane integrity, reduces sperm viability, and impairing motility ¹⁶. Moreover, ROS can directly damage DNA by causing strand breaks and increasing DNA fragmentation ⁹. Such DNA damage not only affects sperm function but can also have implications for embryo development after fertilization^17-19.

3. Impact on Sperm Survival:

Bacteriospermia, defined as the presence of bacteria in semen, has a significant negative impact on sperm viability and overall reproductive health in subfertile men. Numerous studies have investigated the detrimental effects of bacterial infections on sperm parameters, including motility and survival, which are essential for successful fertilization.

Table-1 Provides an overview of significant research examining how different bacterial infections impact sperm mobility in men with subfertility. Each entry in the table corresponds to a distinct study, outlining the specific bacteria investigated, the main outcomes observed, and the consequences for sperm movement.

Year	Bacteria Examined	Key Findings	Implications for Sperm Motility	Reference
2021	Escherichia coli, Klebsiella pneumoniae	Significant reductions in sperm motility were observed in samples containing these gram-negative bacteria, underscoring the harmful impact of bacterial presence on sperm function.	Highlights the direct impact of gram-negative bacteria on reducing sperm motility.	3-5
2022	Ureaplasma urealyticum, Mycoplasma hominis	A correlation was observed between these bacteria and reduced sperm motility rates in infertile men.	Suggests a potential link between these specific bacteria and impaired motility in subfertile men.	22, 24-26, 33
2020	Chlamydia trachomatis	An association was found between Chlamydia infection and reduced sperm motility and vitality.	Indicates that Chlamydia infection could contribute to poor motility and overall subfertility.	34-35
2023	Mixed bacterial flora	Mixed bacterial infections were associated with significantly reduced motility.	Highlights the importance of screening for and addressing mixed bacterial infections to improve motility.	7, 36-37
2024	Staphylococcus aureus	A strong association was observed between S. aureus colonization and reduced sperm motility in a large cohort study.	Emphasizes the negative impact of S. aureus on sperm motility, suggesting that targeted antibiotic treatments could help mitigate these effects.	12, 38

3.1 Analysis of Research on Sperm Viability:

3.2 Impact of Bacteriospermia on Sperm Viability:

Previous research has consistently demonstrated a strong association between bacteriospermia and reduced sperm viability²⁰. Substantial reduction in sperm vitality among men with bacteriospermia compared to those without bacterial infections. Specifically, infections caused by Escherichia coli and Enterococcus faecalis were associated with a notable decrease in the percentage of viable spermatozoa, suggesting that the bacterial species involved may influence the degree of viability reduction ²¹. Production of reactive oxygen species (ROS) by leukocytes in response to bacterial infection and the bacteria themselves. These ROS induce lipid peroxidation in the sperm membrane, which negatively affects both motility and viability^1,13.

3.3 Bacterial Infection and Sperm Motility:

The effects of bacteriospermia extend beyond viability and significantly impair sperm motility, which is a critical factor for successful fertilization. For instance, sperm samples infected with Ureaplasma urealyticum exhibited markedly reduced motility²². This reduction has been linked to disruptions in sperm energy metabolism, indicating that certain bacteria may directly interfere with the energy production pathways essential for optimal motility^23-26. (Table-1)

Moreover, a longitudinal study involving more than 200 men with bacteriospermia found that chronic bacterial exposure led to sustained decreases in sperm motility over time. This study highlighted the importance of infection chronicity and severity as key factors determining the extent of the impact on sperm           health^{1, 25-27}.

3.4 Longevity of Sperm in the Presence of Bacterial Infection:

Bacteriospermia, the presence of bacteria in semen, significantly reduces the sperm lifespan. Semen samples contaminated with bacteria showed elevated rates of sperm apoptosis, marked by increased caspase activity, a key indicator of programmed cell death. This effect is particularly pronounced in infections with Mycoplasma species, which are known to increase sperm cell death and subsequently lower the fertilization potential^1-2.

3.5 DNA Fragmentation Index (DFI) and Its Significance:

The DNA Fragmentation Index (DFI) is a critical marker of sperm health and reflects the proportion of sperm cells with fragmented DNA in a sample. Sperm DNA integrity is vital for successful fertilization and healthy embryo development, making DFI a valuable predictor of male fertility potential and pregnancy outcomes, both in natural conception and assisted reproductive technology (ART). Higher DFI levels are associated with reduced fertilization rates, poorer embryo quality, lower implantation rates, and an increased risk of  miscarriage^{28, 29,30,31,32}.

3.6 The Link between Bacteriospermia and Increased DFI:

Bacteriospermia has been strongly associated with impaired sperm DNA integrity, primarily due to oxidative stress induced by bacterial infections. Pathogenic bacteria such as Escherichia coli, Enterococcus faecalis, and Staphylococcus aureus trigger immune responses that lead to excessive production of reactive oxygen species (ROS), overwhelming the seminal plasma's antioxidant defenses¹³. This oxidative imbalance results in lipid peroxidation, protein denaturation, and DNA fragmentation, compromising sperm function and fertility¹⁵. Research utilizing the sperm chromatin structure assay (SCSA) has shown significantly higher DNA fragmentation index (DFI) scores in men with bacteriospermia compared to those without infections. Furthermore, both Gram-negative and Gram-positive bacteria contribute to this damage through different mechanisms—Gram-negative bacteria release endotoxins that amplify ROS production, while Gram-positive bacteria induce chronic inflammatory responses, exacerbating oxidative stress. Studies have demonstrated that bacteriospermia can elevate ROS levels by up to 50%, leading to a 35–45% increase in sperm DNA fragmentation^1,11,16,25. These findings emphasize the critical role of bacterial infections in male infertility and highlight the need for targeted antimicrobial interventions to improve reproductive outcomes.

4. Clinical Implications and Future Directions:

The correlation between bacteriospermia and elevated sperm DNA fragmentation index (DFI) has critical implications for treating subfertile men. Routine bacteriospermia screening in unexplained male infertility is recommended, as targeted antibiotic therapy has been shown to reduce DFI and improve sperm quality. This enhances conception chances and promotes healthier offspring. Future research should explore bacterial impacts on sperm DNA integrity, track fertility outcomes post-treatment, and investigate antioxidant therapies to mitigate ROS-induced damage³⁹.

4.1 Impact of Bacteriospermia on ART Success and the Need for Targeted Treatment:

Bacteriospermia poses a significant challenge in assisted reproductive technologies (ART) by impairing sperm motility, increasing DNA fragmentation, and ultimately reducing fertilization and embryo development success. Its detrimental effects have been observed in procedures like in vitro fertilization (IVF) and intracytoplasmic sperm injection (ICSI), where bacterial infections compromise sperm integrity and embryo quality. To optimize ART outcomes, incorporating bacteriospermia screening into pre-ART evaluations is essential. Targeted antibiotic therapy before ART has been shown to improve sperm parameters and enhance fertilization potential^1,40. Studies indicate that couples undergoing ICSI, where the male partner received bacteriospermia treatment, demonstrated higher pregnancy success rates than untreated cases. These findings underscore the need for personalized ART protocols that address bacterial infections to maximize reproductive success.

5. DIAGNOSIS AND SCREENING:

5.1 Current Methods for Detecting Bacteriospermia

Diagnosing bacteriospermia in clinical settings primarily relies on the microbiological culture of semen samples, which helps identify and quantify pathogenic microorganisms. Standard protocols include both aerobic and anaerobic cultures, facilitating the detection of common uropathogens such as Escherichia coli, Enterococcus spp., and Staphylococcus aureus ⁴¹.

Recently, molecular techniques, such as polymerase chain reaction (PCR), have been introduced because of their high sensitivity and specificity in detecting bacterial DNA, even at low concentrations⁴². Advanced methods, including next-generation sequencing (NGS), offer comprehensive insights by identifying both culturable and non-culturable bacteria, enabling a complete bacterial profile of semen samples ⁴³. Although these molecular methods provide invaluable information for understanding bacterial involvement in male subfertility, they are not routinely used in clinical practice owing to higher costs and technical requirements.

5.2 Advocating for Routine Screening:

Evidence suggests that subfertile men, especially those with unexplained infertility or frequent reproductive tract infections, could benefit greatly from routine screening for bacteriospermia. Early detection and intervention through regular screening may improve reproductive outcomes⁴⁴. Based on these findings, it is recommended to include bacteriospermia screening as part of standard fertility assessments for high-risk groups. This approach not only enables timely identification and treatment of infections, but also acts as a preventive measure, helping to mitigate the negative effects of untreated bacteriospermia on sperm quality and overall reproductive health.

6. TREATMENT STRATEGIES:

6.1 Antimicrobial Therapy and probiotics supplementation:

Recent studies highlight the effectiveness of targeted antimicrobial therapies and probiotics in managing bacteriospermia and improving sperm quality⁴⁵. A two-week doxycycline regimen has been shown to significantly reduce bacterial load and enhance sperm motility in subfertile men with urogenital infections, while azithromycin effectively treats Mycoplasma-associated bacteriospermia, leading to improved sperm DNA integrity^1,46. Additionally, emerging evidence supports the role of probiotics in restoring a balanced genitourinary microbiota, with Lactobacillus reuteri and Lactobacillus rhamnosus supplementation reducing pathogenic bacterial prevalence and inflammation markers in seminal fluid, thereby promoting overall sperm health^47-48.

6.2 Lifestyle and Dietary Adjustments:

Lifestyle changes, including improved hygiene and dietary modifications, have been proposed as strategies for reducing bacteriospermia. The potential benefits of dietary antioxidants, such as vitamins C and E, include lowering oxidative stress in the reproductive tract, thereby mitigating the negative effects of bacterial-induced inflammation on sperm quality ^{49, 50, 51} (Table-2).

Table 2: This table offers a clear and systematic overview of the practical steps that individuals can take to improve their overall health and potentially mitigate the impact of bacteriospermia through targeted lifestyle adjustments.

Lifestyle Change	Description	Potential Impact on Bacteriospermia
Hygiene Practices
Frequent Hand Washing	Regularly washing hands, especially before meals and after restroom use.	Reduces the transmission of bacteria that could contribute to bacteriospermia.
Proper Genital Hygiene	Daily washing of genital areas with mild soap and water, avoiding harsh chemicals or fragrances.	Minimizes bacterial growth in the genital area, lowering the risk of infections.
Regular Undergarment Changes	Changing underwear daily or more frequently when sweating heavily or after exercise.	Reduces moisture and bacteria buildup, which helps lower infection risks.
Dietary Modifications
Increased Water Intake	Drinking adequate water daily to maintain hydration and support urinary tract health.	Helps flush out bacteria from the urinary tract, reducing infection risks.
Probiotic-rich Foods	Including yogurt, kefir, sauerkraut, and other probiotic foods to introduce beneficial bacteria.	Supports a healthy gut microbiome, positively impacting immunity and reducing infection risks.
Reduction in Sugar Intake	Limiting refined sugars to reduce inflammation and control bacterial growth.	May decrease the proliferation of harmful bacteria in the urinary and reproductive tracts.
Increase in Fiber	Consuming more fruits, vegetables, and whole grains to improve digestion and nutrient absorption.	Enhances gut health and immune function, potentially reducing susceptibility to bacterial infections.

7. FUTURE RESEARCH DIRECTIONS:

The development of targeted antimicrobial therapies for bacteriospermia is essential for improving treatment efficacy while minimizing antibiotic resistance and adverse effects³⁷. Emerging alternatives, such as probiotics and plant-derived antimicrobial agents, offer promising solutions by restoring microbial balance without the complications associated with conventional antibiotics^52-53. Additionally, lifestyle and environmental factors play a crucial role in male reproductive health, with studies suggesting that a diet rich in antioxidants, regular exercise, and reduced exposure to environmental toxins may help mitigate the oxidative stress linked to bacterial infections in semen⁵⁴. Understanding genetic predispositions that influence susceptibility to bacteriospermia or treatment response could pave the way for personalized medicine, allowing for tailored interventions that enhance treatment success⁵⁵. Furthermore, routine bacteriospermia screening in subfertile men could improve early detection and fertility treatment outcomes, emphasizing the need for comprehensive reproductive health assessments^51,54,56-60. Collaborative research between microbiologists, reproductive health specialists, and geneticists is vital to integrating advanced microbiological and genomic insights into fertility management, ultimately leading to more effective and individualized approaches to combating bacteriospermia ^61-63.

8. CONCLUSION:

This review highlights the substantial effect of bacteriospermia on sperm viability and DNA integrity in subfertile men. The presence of bacteria in semen, particularly pathogens such as Escherichia coli, Enterococcus faecalis, and Staphylococcus aureus, is associated with adverse effects on sperm health. These microorganisms trigger inflammatory responses and generate reactive oxygen species (ROS), compromising sperm motility and structural integrity, and increasing DNA fragmentation indices (DFI).

Routine screening for bacteriospermia is recommended for subfertile men with unexplained infertility to ensure an accurate diagnosis and informed treatment planning. Evidence suggests that targeted antimicrobial therapy can effectively manage bacteriospermia, leading to improved sperm parameters and potentially enhanced fertility outcomes.

Addressing bacteriospermia within the broader scope of male subfertility management may lead to personalized and effective fertility treatments. Incorporating bacteriological screening in the initial assessment of subfertile men could refine treatment protocols for assisted reproductive technologies (ART), thereby improving success rates.

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Received on 20.12.2024      Revised on 17.03.2025

Accepted on 26.05.2025   Published on 05.07.2025

Available online from July 10, 2025

Asian J. Res. Pharm. Sci. 2025; 15(3):322-328.

DOI: 10.52711/2231-5659.2025.00047

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