Overview

Syphilis is a preventable and curable sexually transmitted infection (STI). Many people are unaware they have syphilis, and if left untreated, it can lead to serious complications affecting the brain, nerves, blood vessels, and bones.

The infection progresses through several stages. It starts with painless sores, followed by a rash, and eventually, if untreated, can result in severe health issues.

Syphilis remains a significant public health concern in the United States, with rates of infection fluctuating over time. According to data from the Centers for Disease Control and Prevention (CDC), there were over 129,000 reported cases of syphilis in 2019, marking a significant increase compared to previous years.

In recent years, there has been a troubling rise in syphilis cases, particularly among certain populations such as men who have sex with men and those engaged in high-risk sexual behavior.

Symptoms

Syphilis symptoms can vary depending on the stage of the infection. The disease progresses through several stages, each with variable signs and symptoms, including the following:

Primary Syphilis

• Chancre: A painless sore, or chancre, appears at the site of infection, typically on the genitals, anus, or mouth.
• This sore tends to be firm, and round and may go unnoticed due to its painless nature. The chancre may heal on its own within 3 to 6 weeks.

Secondary Syphilis

• Chancre: A painless sore, or chancre, appears at the site of infection, typically on the genitals, anus, or mouth.
• This sore tends to be firm, and round and may go unnoticed due to its painless nature. The chancre may heal on its own within 3 to 6 weeks.
• Hair loss may occur in patches, particularly in the eyebrows, scalp, and genital area.
• Additional symptoms may include weight loss, muscle aches, and joint pain.

Latent Syphilis

• In the latent stage, no symptoms are present, however, the infection persists in your body.
• Latent syphilis can be early (less than 1 year since infection) or late (more than 1 year since infection).

Tertiary Syphilis

• Tertiary syphilis can occur years after the initial infection and may lead to serious complications affecting various organs, including the heart, brain, nerves, eyes, bones, and skin.
• Symptoms of tertiary syphilis depend on the organs affected and may include cardiovascular abnormalities, neurologic symptoms such as paralysis or dementia, vision problems, bone pain, and skin lesions.

Complications

If left untreated, syphilis can lead to various complications, including the following:

• Neurological complications: Syphilis can affect your nervous system, leading to neurosyphilis, which may cause symptoms such as headache, difficulty coordinating muscle movements, paralysis, and cognitive impairment.
• Cardiovascular complications: Untreated syphilis can damage the cardiovascular system, leading to conditions such as aortic aneurysm, aortic regurgitation, and inflammation of the heart muscle, known as myocarditis.
• Tertiary syphilis: In its late stage, syphilis can cause severe damage to multiple organ systems, including the heart, brain, eyes, bones, joints, and liver. This stage can lead to debilitating health problems, such as neurologic disorders, blindness, and organ failure, and can be life- threatening.
• Congenital syphilis: Infants with mothers with untreated syphilis are at risk of congenital syphilis, which can cause stillbirth, premature birth, low birth weight, developmental delays, seizures, and other serious health problems.

Transmission

Syphilis is primarily transmitted through direct contact with syphilitic sores (chancres) during sexual activity, including vaginal, anal, and oral sex.

This condition can also be transmitted from an infected mother to her baby during pregnancy or childbirth, leading to congenital syphilis.

Syphilis is an infection that is highly contagious, especially during the primary and secondary stages when sores or rashes are present. Safe sexual practices, including condom use and regular testing, are important in preventing transmission.

Causes and Risk Factors

Syphilis is caused by the bacterium Treponema pallidum, which is transmitted through sexual contact with an infected individual.

Other causes may include the following:

• Vertical transmission: Pregnant women with syphilis can pass the infection to their unborn babies during pregnancy or childbirth, leading to congenital syphilis.
• Blood transfusions: While rare, syphilis can be transmitted through contaminated blood products.

Risk Factors

Several factors can increase the risk of acquiring syphilis:

• Unprotected sexual activity: Unprotected vaginal, anal, or oral sex with an infected person increases the risk of contracting syphilis. The bacterium Treponema pallidum is highly contagious and can be transmitted through direct contact with syphilitic sores or mucous membranes of an infected person.
• Having multiple sexual partners, particularly without consistent condom use, increases the likelihood of coming into contact with an infected individual and acquiring syphilis.
• Men who have sex with men have a higher risk of acquiring syphilis compared to heterosexual individuals.
• HIV infection: Those infected with HIV have an increased risk of acquiring syphilis due to biological factors, such as compromised immune function, which can make them more susceptible to sexually transmitted infections, including syphilis.
• History of sexually transmitted infections (STIs): Having a history of other STIs, such as gonorrhea or chlamydia, can increase the risk of acquiring syphilis, as these infections may indicate behaviors or circumstances associated with higher risk sexual activity.

Diagnosis

Early diagnosis and treatment are crucial to prevent the progression of syphilis and the development of serious complications. Syphilis diagnosis involves several steps, including a physical examination and laboratory tests.

Physical Examination: healthcare provider will start with a physical examination to look for signs and symptoms of syphilis, such as sores (chancres) or rashes. These physical signs can help identify the stage of the infection.

Blood Tests: The most common diagnostic tests for syphilis are blood tests. These tests detect antibodies produced by the body in response to the infection. Two types of blood tests are typically used:

• Nontreponemal Tests: These include the Rapid Plasma Reagin (RPR) and the Venereal Disease Research Laboratory (VDRL) tests. They are used for initial screening and to monitor the effectiveness of treatment.
• Treponemal Tests: These include the Fluorescent Treponemal Antibody Absorption (FTA-ABS) test and the Treponema pallidum particle agglutination (TPPA) test. They are more specific and used to confirm a syphilis infection.

Direct Detection Methods

• Darkfield Microscopy: This technique is used to directly observe the bacterium (Treponema pallidum) in samples taken from open sores. It is typically used in the early stages of syphilis.
• Polymerase Chain Reaction (PCR): PCR tests can detect the genetic material of Treponema pallidum in various body fluids and tissues. This method is highly sensitive and specific.

Lumbar Puncture (Spinal Tap): In cases where there is suspicion of neurosyphilis (syphilis affecting the nervous system), a lumbar puncture may be performed to analyze cerebrospinal fluid (CSF) for signs of infection.

Syphilis and HIV

Syphilis and HIV share a troubling relationship, as each can exacerbate the effects of the other and increase transmission risks.

Individuals with syphilis are more susceptible to HIV infection. The genital sores caused by syphilis provide entry points for the HIV virus, facilitating its transmission.

For HIV-positive individuals, untreated syphilis can accelerate the progression of both infections. This can lead to more severe health complications, making it essential to manage both conditions promptly and effectively.

The presence of one infection often correlates with behaviors that increase the likelihood of contracting the other, such as unprotected sex or needle sharing. These high-risk behaviors further complicate the prevention and management of both diseases.

Given the interplay between syphilis and HIV, prevention strategies, regular testing, and early treatment are crucial. These measures help manage the conditions more effectively, reduce the risk of transmission, and improve health outcomes for those affected.

Treatment

Detecting syphilis early is crucial because it allows for timely treatment, preventing the disease from progressing to more severe stages. Early detection and intervention can effectively cure syphilis, averting long-term complications such as neurological damage, cardiovascular issues, and the potential transmission of the infection to others. Early intervention also helps reduce the risk of spreading the infection within communities.

Syphilis is typically treated with antibiotics, primarily penicillin, which remains the most effective treatment. The choice of antibiotic and the duration of treatment depend on the stage of syphilis and factors such as patient allergies. Early and appropriate treatment is essential for a successful outcome and to prevent serious health issues.

• Primary and Secondary Syphilis: In these early stages, a single dose of penicillin is often sufficient to cure the infection. Other antibiotics, such as doxycycline, may be used in cases of penicillin allergy.
• Latent Syphilis: When the infection has progressed beyond the early stages but hasn't caused symptoms, treatment usually involves a longer course of antibiotics, typically administered as weekly injections, intramuscularly, of Benzathine penicillin G administered as 3 doses.
• Tertiary Syphilis: If the infection has advanced to this stage and caused significant damage to organs such as the brain or heart, treatment may require longer courses of antibiotics and may not always reverse the damage already done.
• Neurosyphilis: When syphilis infects the central nervous system, treatment often involves intravenous penicillin, specifically aqueous crystalline penicillin G, administered over 10 to 14 days.

It is important to remember that treatment effectiveness is high when syphilis is detected and treated early. More severe stages can be challenging to treat and may lead to irreversible complications. Additionally, antibiotic resistance is a concern, although syphilis has remained susceptible to penicillin in most cases.

Prevention

Syphilis can be prevented through strategies and precautions, including the following:

• Maintain a mutually monogamous relationship with an uninfected.
• Consistent and correct use of condoms during sexual activity significantly reduces your risk of syphilis transmission. However, syphilis can still be transmitted through contact with infected skin or mucous membranes not covered by a condom.
• Routine testing for syphilis, especially for those with multiple sexual partners or those engaged in high-risk sexual behaviors, can lead to early detection and treatment. Immediate treatment with antibiotics can prevent the progression of the disease and reduce transmission rates.
• Do not share needles. Syphilis can also be transmitted through sharing needles or syringes contaminated with infected blood.
• Pregnant women should receive prenatal care, including screening for syphilis, to prevent mother-to-child transmission of the infection.

By adopting these preventive measures, you can reduce your risk of contracting syphilis and contribute to the overall prevention of the disease in communities.