Clinical and laboratory characteristics of ocular syphilis and neurosyphilis among individuals with and without HIV infection

BASHH UK guidelines for the management of syphilis 2024

The 2024 UK guidelines for the management of syphilis are in line with current evidence and practice within the UK. Key updates are detailed at the start of the article. These guidelines are accompanied by the first UK guidelines for the management of syphilis in pregnant people and children, 2024.

Influence of gender on clinical presentation, management practices and outcomes of ocular syphilis

Ocular syphilis is a re-emerging inflammatory eye disease with a clear gender imbalance, disproportionately affecting men. We investigated the impact of gender on the presentation, management practices and clinical outcomes of this condition. Data generated from a study of patients consecutively diagnosed with ocular syphilis who attended a subspecialist uveitis service at one of four hospitals in Brazil over a 30-month period were disaggregated for analysis by gender. Two-hundred and fourteen eyes (161 men and 53 women) of 127 patients (96 men and 31 women) were included. Posterior uveitis was the most common presentation in both men and women (80.1% vs. 66.7%, p > 0.05), but men were significantly more likely to have vitritis as a feature of their disease (49.4% versus 28.8%, p = 0.019). Three eyes of women had nodular anterior scleritis (p = 0.015). Men were more likely to undergo a lumbar puncture to assess for neurosyphilis (71.9% vs. 51.6%, p = 0.048), but men and women undergoing a lumbar puncture were equally likely to have a cerebrospinal fluid abnormality (36.2% vs. 25.0%, p = 0.393). All patients were treated with aqueous penicillin G or ceftriaxone, and there was a trend towards more men receiving adjunctive systemic corticosteroid treatment as part of their management (65.2% vs. 46.7%, p = 0.071). There were no significant differences in the age of presentation, bilaterality of disease, anatomical classification of uveitis, initial or final visual acuity, and rates of ocular complications between men and women. Our findings indicate that ocular syphilis has comparable outcomes in men and women, but that there are differences in the type of ocular inflammation and management practices between the genders.

Bilateral Anterior Uveitis in the Context of Concurrent HIV and Syphilis Co-infection

This case report presents bilateral anterior uveitis (BAU) in a 26-year-old male concurrently infected with HIV and syphilis, highlighting a rare and complex clinical presentation. BAU, typically linked with systemic diseases, poses significant diagnostic and therapeutic challenges when co-occurring with such infections. Despite common associations with posterior uveitis in co-infected individuals, this patient displayed BAU, underscoring the variability in ocular manifestations. The case details the clinical progression, diagnosis, and management strategies, emphasizing the need for comprehensive ophthalmologic and systemic evaluation. The report aims to enhance awareness and understanding of the implications of concurrent HIV and syphilis infections in ocular inflammation, advocating for tailored treatment approaches and a high index of suspicion in similar presentations.

Syphilitic scleritis and episcleritis: A review

Scleritis and episcleritis are rare, but potentially sight-threatening forms of syphilis. To provide a full description of this neglected subset of ocular syphilis, we evaluated the English literature for reports of syphilitic scleritis and episcleritis, recording the demographics, clinical characteristics, serological data, management practices, treatment responses, and visual outcomes. Previously published descriptions of 44 patients with syphilitic scleritis (50 eyes) and 9 patients with syphilitic episcleritis (14 eyes) were identified. The predominant type of scleritis was anterior scleritis, accounting for 92.9% of cases, with nodular anterior scleritis being the most frequent subtype at 58.1%. Almost one-quarter of patients were co-infected with human immunodeficiency virus (HIV). Initial misdiagnosis was common and led to delays in initiating treatment with appropriate antibiotics. Visual outcomes were often good in both scleritis and episcleritis, irrespective of HIV infection status, although complications including scleral thinning, keratitis, and uveitis, along with permanent visual loss and an association with neurosyphilis, were reported. Response to antibiotic treatment was typically rapid, often within 1 week. With the rising global incidence of syphilis, testing patients with scleritis or episcleritis for this infectious disease is important to ensure prompt diagnosis and treatment for best ocular and systemic outcomes.

Syphilis for dermatologists: Current concepts

Dermatologists are familiar with the classic aspects of syphilis. Our objective in this update is to display novel features of sexually acquired syphilis, its pathophysiology, natural history, atypical clinical variants, skin of color, clinical pearls, and prospects. Textbook knowledge, congenital syphilis, epidemiology, and historical data are excluded.

Syphilis

Syphilis is a sexually and vertically transmitted bacterial infection caused by the bacterium Treponema pallidum. Its prevalence is high in low-income and middle-income countries, and its incidence has increased in high-income countries in the last few decades among men who have sex with men. Syphilis is a major cause of adverse pregnancy outcomes in low-income and middle-income countries. Clinical features include a primary chancre at the point of inoculation, followed weeks later by the rash of secondary syphilis, a latent period, and in some cases, involvement of the eyes, CNS, and cardiovascular systems. It is diagnosed serologically. A single intramuscular dose of long-acting benzathine penicillin is recommended for people who have had syphilis for less than 1 year and longer courses for people with late latent syphilis. Control strategies include screening and treatment of all pregnant women, and targeted interventions for groups at high risk. Vaccine development, research on antibiotic prophylaxis, and digital messaging as prevention strategies are ongoing.

Identification of potential biomarkers for diagnosis of syphilis from the cerebrospinal fluid based on untargeted metabolomic analysis

The infection rate of syphilis continues to rise globally, and the difficulty in diagnosis of neurosyphilis promptly needs to be resolved. More specific and sensitive diagnostic markers for latent syphilis and neurosyphilis should be found. Here the metabolic profiles of 88 cerebrospinal fluid samples from syphilis patients and controls were analyzed by LC/MS-based untargeted metabolomics. In total, 272 metabolites based on 3937 features obtained in ESI- mode and 252 metabolites based on 3799 features in ESI+ mode were identified. The experimental process was evaluated by principal component analysis, partial least squares discriminant analysis, and hierarchical cluster analysis. A clear separation between latent syphilis and neurosyphilis was found. Levels of lipid and linoleic acid metabolites, such as 9-oxo-octadecadienoic acid and 9,10,13-trihydroxyoctadecenoic acid, were increased in syphilis patients. In patients with neurosyphilis, significant changes in levels of 5-hydroxy-L-tryptophan (5-HTP) and acetyl-N-formyl-5-methoxykynurenamine (AFMK) in the tryptophan-kynurenine pathway were also detected. Only one metabolite, theophylline, differed significantly between symptomatic and asymptomatic neurosyphilis patients. Additionally, KEGG analysis revealed significant enrichment of tryptophan metabolism pathways, indicating a high correlation between tryptophan metabolism and syphilis symptoms. Levels of linoleic acid metabolites, 5-HTP, AFMK and theophylline were significantly altered in different patients. The role of these differential metabolites in the development of syphilis is worthy of further exploration. Our results may promote the development of biomarkers for diagnosis of latent syphilis from neurosyphilis, and for that of asymptomatic neurosyphilis from symptomatic neurosyphilis in the future.

Neurosyphilis among people with and without HIV infection: A Danish nationwide prospective, population-based cohort study 2015–2021

BACKGROUND

Comparative data on clinical presentation, laboratory characteristics, treatment, and outcome of neurosyphilis (NS) in people living with HIV (PLWH) and NS patients without HIV are scarce.

METHODS

Nationwide, population-based, prospective cohort study on all adults with NS diagnosed between 2015 and 2021 at departments of infectious diseases in Denmark.

RESULTS

We identified 108 patients with NS, which equals a yearly incidence of 0.3/100,000 adults. The median age was 49 years, 85 (79%) were male, 43 (40%) were men having sex with men and 20 (22%) were PLWH. Ninety-five (88%) had early NS, 37 (34%) had ocular or ocular and otogenic NS, and 27 (25%) had symptomatic meningitis. Most common symptoms were visual disturbance (44%), skin rash (40%), fatigue (26%) and chancre (17%). Median CSF leukocyte count was 27 × 10⁶ cells/L. PLWH less often had neurological deficits (p = 0.02). Unfavorable outcome was observed in 23 (21%) at discharge of whom 0 were PLWH (p = 0.01). Among the 88 NS patients without HIV a CSF leukocyte count of ≥ 30 × 10⁶ cells/L was associated with unfavorable outcome (OR = 3.3 (95% confidence interval: 1.1-10.4)).

CONCLUSIONS

PLWH with NS have better outcomes than NS patients without HIV infection.

Human Immunodeficiency Virus and Uveitis

Uveitis is one of the most common ocular complications in people living with the Human immunodeficiency virus (HIV) and can be classified into HIV-induced uveitis, co-infection related uveitis, immune recovery uveitis, and drug-induced uveitis. The introduction of antiretroviral therapy has considerably changed the incidence, diagnosis, and treatment of different types of HIV-related uveitis. Furthermore, the specific immune condition of patients infected with HIV makes diagnosing HIV-related uveitis difficult. Recent studies have focused on the growing prevalence of syphilis/tuberculosis co-infection in uveitis. Simultaneously, more studies have demonstrated that HIV can directly contribute to the incidence of uveitis. However, the detailed mechanism has not been studied. Immune recovery uveitis is diagnosed by exclusion, and recent studies have addressed the role of biomarkers in its diagnosis. This review highlights recent updates on HIV-related uveitis. Furthermore, it aims to draw the attention of infectious disease physicians and ophthalmologists to the ocular health of patients infected with HIV.

An Updated Review of Recent Advances in Neurosyphilis

Neurosyphilis is caused by Treponema pallidum invading the central nervous system, of which the incidence is increasing worldwide. Due to its variable clinical manifestations, diagnosis of neurosyphilis remains challenging, especially the asymptomatic form. This review focuses on recent advances in neurosyphilis, including epidemiology, clinical manifestations, laboratory findings, comorbidities, diagnosis, treatment, prognosis, and basic research. The expansion of men who have sex with men and the infection of human immunodeficiency virus mainly accounted for the increasing incidence of neurosyphilis. The rate of some historically described forms of neurosyphilis in the pre-antibiotic era declined significantly; atypical features are more prevalent. Neurosyphilis, regarded as a great mimicker for neuro-ophthalmic, audio-vestibular, and psychiatric disorders, often presents concomitantly with other diseases, including metabolic disorders. Studies on long non-coding RNAs, miRNAs, chemokines, and metabolites in peripheral blood and cerebrospinal fluid may facilitate exploring the pathogenesis and identifying novel biomarkers of neurosyphilis. The drug resistance of Treponema pallidum to penicillin has not been reported; ceftriaxone was proposed to be more effective than penicillin, whereas few randomized controlled trials supported this view. This study may pave the way for further research, especially the diagnosis and treatment of neurosyphilis.

Syphilis-related Ocular Inflammation in HIV-positive and HIV-negative Patients

PURPOSE

To evaluate the clinical characteristics and visual outcomes of ocular syphilis in human immunodeficiency virus (HIV)-positive and negative patients.

METHODS

We performed a retrospective chart review of all patients with newly diagnosed ocular syphilis between January 2015 and August 2021.

RESULTS

68 eyes of 41 patients (22 eyes in 12 HIV-positive patients, 46 eyes in 29 HIV-negative patients) were included. The most common ophthalmic feature was posterior uveitis in HIV-positive and anterior uveitis in HIV-negative patients; 58.3% (7 out of 12 patients) of HIV-positive and 48.2% (14 out of 29 patients) of HIV-negative patients were diagnosed with neurosyphilis. There were no significant differences in laterality, presence of concurrent rash, rapid plasma reagin (RPR) titers, presenting, and final corrected visual acuity between both groups.

CONCLUSION

Nearly one-fifth of eyes may suffer from severe visual loss of ≤ 20/200. HIV co-infection may not result in visual outcomes in syphilis.

Clinical features and incidence of visual improvement following systemic antibiotic treatment in patients with syphilitic uveitis

To describe the clinical features, longitudinal pattern, and incidence rate of improvement of visual acuity (VA) following antibiotic therapy in patients with syphilitic uveitis. A total of 36 patients were included in this retrospective study from 2009 to 2020. The longitudinal patterns of mean VA values during follow-up were analyzed using a linear mixed model. Most patients were men with HIV coinfection (81%) and presented with panuveitis (49%). The mean VA at baseline improved from 0.97 to 0.39 logMAR at 6 months and remained stable thereafter. The cumulative incidence of VA ≥ 20/25 achieved by 2 years was 70%. Receiving antibiotic therapy within four weeks of the onset of ocular symptoms (adjusted hazard ratio [aHR] 3.4, P = 0.012), absence of HIV coinfection (aHR 8.2, P < 0.001), absence of neurosyphilis (aHR 6.5, P = 0.037), better presenting VA (aHR 5.0, P = 0.003), and intermediate uveitis as opposed to panuveitis (aHR 11.5, P = 0.013) were predictive of achieving VA ≥ 20/25. Men with HIV coinfection represented the majority of our patients. Visual outcomes, in response to antibiotics, were favorable. Delayed treatment, poor presenting VA, presence of HIV coinfection, and concomitant neurosyphilis decreased the likelihood of VA restoration.

Demographic, Clinical and Laboratory Characteristics of Ocular Syphilis: 6-Years Case Series Study From an Eye Center in East-China

Purpose

To report the demographic, clinical, and laboratory characteristics of ocular syphilis based on a 6-year case series study from an eye center in East-China.

Methods

A total of 131 cases (191 eyes) of ocular syphilis and the annual number of total syphilis cases from January 2016 to December 2021, were included in this study. Detailed medical records including systemic and ophthalmic medical history, a complete ophthalmic examination, color fundus photography, B-type ultrasound, fundus fluorescein angiography (FFA), spectral domain optical coherence tomography (SD-OCT), laboratory tests of the serum and cerebrospinal fluid (CSF) samples, as well as visual field test and orbital or cranial MRI in cases with suspected optic neuritis or optic atrophy, were collected and analyzed. Pearson Chi-square or Fisher’s exact tests was used for statistics analysis.

Results

Of the 131 cases with ocular syphilis, 86 cases were in men and 6 cases had a past medical history or systemic manifestation of syphilis. HIV was found in only 2 of 70 cases undergoing serum HIV test. The average age was 54.0 years, ranging from 26–85 years. The average percentage of ocular syphilis out from the total syphilis cases was 5.1%, the average titer of serum rapid plasma regain (RPR) at presentation was 1:32, ranging from 1:1–1:512. The most predominant manifestation of ocular syphilis was posterior uveitis, followed by optic neuritis, optic atrophy, panuveitis, retinal vasculitis, and retinitis. The median of BCVA of all 191 eyes was 20/200 (ranging from no light perception to 20/20), and 20/40 (ranging from no light perception to 20/20) at presentation and final follow-up, respectively. Ocular syphilis with active inflammation responded well to penicillin therapy, no matter the initial visual acuity, ocular disease type, or RPR titers, as long as it was diagnosed early and treated properly and promptly. However, cases with optic atrophy, acute retinal necrosis, late diagnosis, permanent disruption, or loss of outer segment of photoreceptors of macular retina on SD-OCT showed poor visual improvement after therapy.

Conclusions

Early diagnosis of ocular syphilis is still challenging in clinical practice and syphilis tests should be routinely performed in patients with uveitis, retinitis, optic neuritis, and optic atrophy.

Pyramidal Inflammatory Deposits of the Retinal Pigment Epithelium and Outer Retina in Ocular Syphilis

PURPOSE

To evaluate the role of OCT in the diagnosis of uveitis secondary to syphilis.

DESIGN

Consecutive, retrospective case series.

PARTICIPANTS

All patients 18 years of age or older with ocular syphilis from 2 tertiary referral centers.

METHODS

All patients who were diagnosed with intermediate uveitis, posterior uveitis, or panuveitis secondary to syphilis were included in the study (40 patients representing a total of 62 eyes) to identify important imaging features to aid in diagnosis. Patients underwent confirmatory serologic testing, OCT imaging, and dilated examination by a uveitis specialist.

MAIN OUTCOME MEASURE

Hyperreflective retinal lesions on OCT.

RESULTS

The mean age of the study population was 42.9 ± 12.16 years. Forty-five percent of the eyes included in this study harbored hyperreflective pyramidal lesions of the outer retina and retinal pigment epithelium on OCT. Fifty-four percent of eyes with these imaging findings did not show a placoid retinal lesion on examination. Sixty-eighty percent of the described outer retinal lesions on OCT resolved after treatment for syphilis. Visual acuity ranged from normal (20/20) to no light perception, with a mean of 20/43 at diagnosis, and improved significantly to a mean visual acuity of 20/26 after treatment (P < 0.05). Vision-threatening complications were seen in less than 5% of eyes and included both treatable and irreversible causes of vision loss, including retinal detachment, cystoid macular edema, and optic neuropathy.

CONCLUSIONS

Patients treated for uveitis secondary to syphilis achieve good visual recoveries. Outer retinal lesions seen on OCT are common and can serve as an additional imaging finding of the disease.

Ocular syphilis in patients with human immunodeficiency virus/acquired immunodeficiency syndrome in the era of highly active antiretroviral therapy

Purpose:

Re-emergent ocular syphilis in patients with Human immunodeficiency virus (HIV) co-infection has both diagnostic and management difficulties because of the overlapping risk factors. The clinical manifestations described in non-HIV may not be the same in patients with HIV coinfection. Immune recovery uveitis (IRU) may also alter the course of the disease causing recurrences. We studied the clinical features in correlation with CD4 counts, systemic immune status, sexual preferences and management outcomes in HIV/AIDS patients with ocular syphilis in the highly active antiretroviral treatment (HAART) era from a high endemic HIV population like India.

Methods:

Retrospective analysis of all patients with ocular syphilis and HIV/AIDS seen between 2016 and 2019 was done.

Results:

A total of 33 patients (56 eyes) with a CD4 count range of 42–612 cells/cu.mm were included. Ocular syphilis was found to be higher in individuals with high risk behavior such as men who have sex with men (MSMs) (45%). Panuveitis was the commonest manifestation (53.57%) and was even the presenting feature of HIV and syphilis in many patients. Significant vitritis, usually uncommon in HIV/AIDS immunocompromised patients was noted even with low CD4 counts in patients with ocular syphilis. Significant correlation was noted between ocular presentation and CD4 counts (P < 0.05).

Conclusion:

Ocular syphilis presents differently in patients with HIV/AIDS. Diffuse retinitis is seen commonly in low counts (<100 cells/cu.mm). Classical placoid chorioretinitis lesions usually described in non-HIV individuals is uncommon in HIV patients and is seen in higher CD4 counts ( >400 cells/cu.mm). Ocular manifestations can be an indicator of the immune status of the patient. Not all patients with ocular manifestations have associated features of systemic syphilis. Ocular manifestations can be the first presentation of HIV/AIDS. Although, there is good response to systemic penicillin and HAART, recurrences and immune recovery uveitis (IRU) can also occur.

Double Trouble: Challenges in the Diagnosis and Management of Ocular Syphilis in HIV-infected Individuals

Syphilis and HIV infection may coexist in the same individual. Ocular syphilis and/or neurosyphilis may develop at any stage of coinfection, with a stronger association between ocular and neurosyphilis in individuals living with HIV, than in HIV-uninfected individuals. The diagnosis of ocular syphilis in HIV-infected and -uninfected patients remains with some controversy due to unspecific clinical manifestations and limited diagnostic tests. Penicillin is the mainstay of treatment of ocular syphilis, but alternative options are warranted. This review describes the epidemiology, pathophysiology, and clinical manifestations, as well as the diagnostic and therapeutic challenges posed by ocular syphilis against the background of HIV coinfection.