Report From the National Academies of Sciences, Engineering and Medicine-STI: Adopting a Sexual Health Paradigm-A Synopsis for Sexually Transmitted Infection Practitioners, Clinicians, and Researchers

The Impacts and Consequences of Sexually Transmitted Infections in the United States

ABSTRACT

Millions of people in the United States are affected by sexually transmitted infections (STIs) every year, with profound consequences for the individual, their community, and society at large. In this review, we aim to summarize the epidemiology of 4 STIs: Chlamydia trachomatis, Neisseria gonorrhoeae, Treponema pallidum, and herpes simplex virus, and to highlight the consequences of those infections among individuals and the healthcare system. Untreated N. gonorrhoeae, C. trachomatis, T. pallidum, or herpes simplex virus infection can result in female infertility, stillbirth, premature birth, and low birth weight. As many as 10% of incident HIV infections among men who have sex with men in the United States have been attributed to either N. gonorrhoeae or C. trachomatis infection. In 1 year in the United States, incident C. trachomatis infection resulted in $824 million lifetime medical costs and a loss of 1,541 lifetime quality-adjusted life years (QALYs) among men and 111,872 among women, while incident N. gonorrhoeae infection led to $323 million in lifetime medical costs, and a loss of 386 QALYs among women and 12,112 among men. Incident T. pallidum infection in 1 year resulted in $206 million in medical costs and a loss of 13,349 QALYs among both men and women, while genital herpes led to $107 million in medical costs and a loss of 33,100 QALYs. STI-attributable infertility alone resulted in more than $135 million in direct medical costs. Cumulatively, STIs lead to substantial financial costs to individuals and the health system, as well as long-term reductions in quality of life.

Provincial distribution and factors associated with self-reported sexually transmitted infections and their symptoms among women in Sierra Leone

BACKGROUND

Sexually transmitted infections (STIs) are a significant public health concern worldwide. These infections can have severe consequences for women's health, including pelvic inflammatory disease, infertility, and increased risk of HIV acquisition. Understanding the prevalence and factors associated with STIs among women in Sierra Leone is crucial to developing effective prevention and treatment strategies. This study investigated the provincial distribution and factors associated with self-reported STIs (SR-STIs) and STI symptoms among women in Sierra Leone.

METHODS

The study used data from the 2019 Sierra Leone Demographic and Health Survey, comprising 13,965 women aged 15 to 49 who have ever had sex. Provincial variations in the prevalence of SR-STIs and STI symptoms were presented using a spatial map. A binary logistic regression analysis was performed to assess the factors associated with SR-STIs and STI symptoms among women in Sierra Leone. The results were presented as adjusted odds ratios (aOR) with a 95% confidence interval (CI).

RESULTS

The overall prevalence of SR-STIs and their symptoms was 21.6% [20.4, 22.9] among women in Sierra Leone. Higher odds of SR-STIs and their symptoms were associated with being aged 25-29 (aOR = 1.35, 95% CI = 1.10,1.66), 30-34 (aOR = 1.38, 95% CI = 1.09,1.74), 35-39 (aOR = 1.39, 95% CI = 1.10, 1.77), having tested for HIV (aOR = 1.16, 95% CI = 1.04, 1.29), and having multiple sexual partners (aOR = 2.25, 95% CI = 1.80, 2.83) compared to those in the reference category. Being in the rich wealth index (aOR = 1.32, 95% CI = 1.11, 1.57), living in the Northern (aOR = 2.43, 95% CI = 2.08, 2.83) and Northwestern province (aOR = 3.28, 95% CI = 2.81, 3.83), and being covered by health insurance (aOR = 3.19, 95% CI = 2.62, 3.88) were associated with higher odds of SR-STIs and their symptoms. Lower odds of SR-STIs and their symptoms were found among women with one (aOR = 0.81, 95% CI = 0.68, 0.96), two (aOR = 0.75, 95% CI = 0.61, 0.93), three (aOR = 0.66, 95% CI = 0.53, 0.83), and four or more children (aOR = 0.62, 95% CI = 0.49, 0.77], those residing in rural areas (aOR = 0.81, 95% CI = 0.69, 0.94), and women living in the Southern province (aOR = 0.67, 95% CI = 0.57, 0.80) compared to those in the reference category.

CONCLUSION

The findings indicate that SR-STIs and their symptoms are prevalent among women in Sierra Leone. Our findings underscore the urgent need for targeted public health interventions to address the SR-STIs and their symptoms among women in Sierra Leone. The increased risk among women aged 25-39, those with multiple sexual partners and those from wealthier backgrounds, suggests that educational programmes focusing on safe sexual practices and STI prevention should be prioritized in urban and affluent areas. Additionally, the lower odds of SR-STIs among women with more children and those in rural regions indicate that family dynamics and geographic factors may offer protective benefits, which could be leveraged in public health messaging. Our findings highlight the importance of tailoring health services and outreach efforts to effectively reach and support vulnerable populations, ultimately aiming to reduce the incidence of SR-STIs.

The microbial revolution: Unveiling the benefits of vaginal probiotics and prebiotics

Vaginal health is essential to a woman's overall well-being, as abnormalities in vaginal health can lead to a variety of gynaecological disorders, such as urinary tract infections, yeast infections, and bacterial vaginosis. The vaginal microbiome is essential for the prevention of these infections. Disruptions in this microbial ecosystem can significantly impact vaginal health. The concept of utilizing probiotics and prebiotics to stimulate the growth of protective vaginal microbiota has gathered substantial interest in recent years. Probiotics are live micro-organisms that strengthen and restore vaginal microbial balance by lowering pH levels, production of bacteriocins, biofilm disruption, modulation of immune response, and production of hydrogen peroxide (H2O2), consequently combating the development of pathogens. Prebiotics are oligosaccharides that encourage the development of probiotics such as lactobacilli species. Probiotics and prebiotics also have some broader implications for vaginal health, including their role in minimizing the incidence of premature birth, optimizing fertility, managing menopausal symptoms, and preventing vaginal infections. Synbiotics are a combination of probiotics and prebiotics that deliver additional benefits by encouraging the development and activity of beneficial microbes. Furthermore, postbiotics are bioactive compounds derived from probiotic bacteria during fermentation that have immunomodulatory actions and provide an additional layer of protection against vaginal infections. The present study highlights the most prevalent vaginal infections and limitations of existing therapies that influence the vaginal microbiota. The profound consequences of probiotics and prebiotics in women's health, including their role in minimizing the prevalence of vaginal infections and promoting overall vaginal health, as well as advanced therapeutic strategies such as synbiotics and postbiotics, are also discussed. The literature offers significant insights into the mechanism, efficacy, and safety of probiotics and prebiotics to healthcare providers and researchers.

Filling in the Gaps: Updates on Doxycycline Prophylaxis for Bacterial Sexually Transmitted Infections

Over the past two decades, cases of sexually transmitted infections (STIs) due to syphilis, gonorrhea, and chlamydia have been rising in the United States, disproportionately among gay, bisexual, and other men who have sex with men (MSM), as well as racial and ethnic minorities of all genders. In this review, we address updates about the evidence on doxycycline post-exposure prophylaxis (doxy-PEP) for prevention of bacterial STIs, including efficacy, safety, antimicrobial resistance (AMR), acceptability, modeling population impact, and evolving guidelines for use. Equitable implementation of doxy-PEP will require evaluation of who is offered and initiates it, understanding patterns of use and longer-term STI incidence and AMR, provider training, and tailored community education.

Voluntary Medical Male Circumcision for HIV Prevention: a Global Overview

PURPOSE OF REVIEW

With the promise of HIV prevention, there has been a scale-up of voluntary medical male circumcision (VMMC) in high HIV incidence/low circumcision prevalence nations worldwide. Nonetheless, debates over the implementation and the effectiveness and safety of the VMMC in real-world settings persist. We revisit the role of VMMC in HIV prevention to inform health professionals, policymakers, and advocates or opponents in this new era.

RECENT FINDINGS

There has been substantial progress on VMMC scale-up to date, but this has varied considerably by region. The evidence of solid and direct protection of VMMC is available for heterosexual men and older adolescent boys in sub-Saharan Africa. The protective effect in men who have sex with men is suggested by systematic reviews but is not confirmed by clinical trials. Sexual partners, including women, likely benefit indirectly from the increased VMMC coverage through a decreased risk of exposure to infected male partners. Fortunately, the preponderance of studies does not suggest higher sexual risk behaviors among circumcised men, so-called risk compensation. VMMC requires health systems strengthening and continued promulgation of other evidence-based HIV prevention strategies to be successful. Health authorities in high HIV incidence areas that have low circumcision coverage should implement VMMC within a context of complementary biomedical and behavioral prevention strategies.

[MC1R is highly expressed in esophageal squamous cell carcinoma]

OBJECTIVE

To investigate the expression of MC1R in esophageal squamous cell carcinoma and its correlation with the clinicopathological parameters.

METHODS

We analyzed the expression of MC1R in esophageal cancer based on data from TCGA databse and examined its expression levels using RT-PCR and Western blotting in a human esophageal epithelial cell line BAr-T, human esophageal squamous cell carcinoma cell lines ECA109, KYSE30, KYSE150, KYSE510, TE-1, TE-13, and EC9706, a human gastric cancer cell line SGC7901 and 19 pairs of esophageal squamous cell carcinoma tissues and adjacent tissues.Immunohistochemistry was used to detect MC1R expression levels in 32 pairs of paraffin-embedded sections of esophageal squamous cell carcinoma and adjacent tissues, and the correlation of MC1R expression and the patients'clinicopathological characteristics was analyzed.

RESULTS

Bioinformatics analysis showed that MC1R was significantly overexpressed in esophageal cancer tissues (P < 0.05).MC1R expression was also increased in 5 esophageal squamous cell carcinoma cell lines ECA109, KYSE30, KYSE510, TE-13, EC9706 and the gastric cancer cell line SGC7901 as compared with that in esophageal epithelial cells (P < 0.05).Immunohistochemistry revealed significantly increased MC1R expression in esophageal squamous cell carcinoma tissue sections in comparison with the adjacent tissue sections (P < 0.05).In patients with esophageal squamous cell carcinoma, a high MC1R expression was detected mainly in those with an old age, positive for middle-thoracic involvement, and with moderately differentiated tumor cells, and showed a correlation with T stage of tumor (P < 0.05), but not with the other clinicopathological parameters such as gender, age, degree of cell differentiation, primary tumor site, or TNM stage (P>0.05).

CONCLUSION

MC1R is highly expressed in esophageal squamous cell carcinoma and may serve as a molecular biomarker to assist in the diagnosis of esophageal squamous cell carcinoma.

Multilocus sequence typing of Treponema pallidum pallidum in children with acquired syphilis by nonsexual contact

Background: There are scarce data of Treponema pallidum subsp. pallidum (TPA) characterization in children with syphilis. Nonsexually acquired transmission (NSAT) of TPA is possible in infants through close contact. Methods: A descriptive study in five families with NSAT of syphilis was conducted. Polymerase chain reaction detection of TPA in pediatric index cases (n = 6) and their relatives (n = 44) were conducted followed by multilocus sequence typing (MLST). Results: TPA was detected in swab samples in 16 cases and 12 were characterized by MLST. Nichols lineage was identified in two of five families and SS14-lineage in three of five. In four families, MLST profiles linked index cases to relatives. Conclusion: This is the first report of TPA characterization in children infected by NSAT.

Prioritizing syphilis control: Now is the time for action

Syphilis control programs and research received fewer resources and attention compared to HIV and other sexually transmitted infections (STIs) in the pre-pandemic era. The neglect of syphilis within comprehensive STI control efforts may be related to diagnostic (poor diagnostics), historical (legacies of racism in research), public health (limited partner services), and social problems (limited public engagement). At the same time, there are increasingly compelling reasons to prioritize syphilis control programs and research by harnessing lessons learned and advances during COVID-19. The closure of many STI facilities has accelerated new syphilis diagnostic pathways (e.g., syphilis self-testing), providing new ways for people to be screened outside of clinics. COVID-19 has underlined health inequities that fuel syphilis transmission, providing an opportunity to reckon with the historical legacy of racism that is linked to syphilis research. COVID-19 partner tracing efforts have also contributed to additional resources for partner services which may enhance syphilis control efforts. Finally, COVID-19 has demonstrated the importance of public engagement, making the case for greater public involvement in syphilis control and prevention programs. Urgent action is needed to prioritize syphilis control in a wide range of settings.

Sexually transmitted infections and female reproductive health

Women are disproportionately affected by sexually transmitted infections (STIs) throughout life. In addition to their high prevalence in women, STIs have debilitating effects on female reproductive health due to female urogenital anatomy, socio-cultural and economic factors. In this Review, we discuss the prevalence and impact of non-HIV bacterial, viral and parasitic STIs on the reproductive and sexual health of cisgender women worldwide. We analyse factors affecting STI prevalence among transgender women and women in low-income settings, and describe the specific challenges and barriers to improved sexual health faced by these population groups. We also synthesize the latest advances in diagnosis, treatment and prevention of STIs.

Women are more affected by sexually transmitted infections than men. This Review examines the impact of non-HIV STIs on women’s health, and discusses recent advances and current challenges in the treatment and prevention of STIs.