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Emergency and Acute Medicine - Syphilis
Syphilis is a sexually transmitted infection caused by the spirochete bacterium Treponema pallidum. It is acquired through contact with infected mucous membranes or disrupted skin and remains a significant global health issue, with millions of new cases diagnosed annually. The disease progresses through distinct stages—primary, secondary, latent, and tertiary—each with characteristic clinical features.
Primary syphilis typically presents after an incubation period of about three weeks. The hallmark lesion is a painless chancre at the site of inoculation, which appears as a clean-based, well-demarcated ulcer, usually on the genitalia, rectum, or oral mucosa. Regional lymphadenopathy is common, and the lesion heals spontaneously within three to six weeks, often leading to missed diagnosis if not recognized early.
Secondary syphilis develops several weeks after the primary stage due to hematogenous dissemination of the organism. It is characterized by a diffuse, symmetric rash that often involves the palms and soles, a key diagnostic clue. Lesions may be maculopapular, papular, or polymorphic. Other features include mucous patches, condyloma lata (broad, moist, highly infectious lesions in intertriginous areas), generalized lymphadenopathy, and systemic symptoms such as fever, malaise, sore throat, and weight loss. Less common findings include patchy “moth-eaten” alopecia and ocular or neurologic involvement. This stage also resolves spontaneously if untreated.
Following resolution of secondary symptoms, the disease enters a latent phase, during which patients are asymptomatic but serologically positive. Early latent syphilis remains potentially infectious, while late latent syphilis is generally not, except in pregnancy where vertical transmission can occur. Without treatment, a subset of patients progress to tertiary syphilis years to decades later.
Tertiary syphilis is a destructive phase that may involve multiple organ systems. Neurosyphilis is the most common manifestation and can present with meningitis, cranial nerve deficits, dementia, or tabes dorsalis, which involves degeneration of the spinal cord leading to sensory loss and gait abnormalities. Cardiovascular syphilis may cause aortic aneurysm or aortic valve insufficiency. Gummatous syphilis results in granulomatous lesions affecting skin, bone, or internal organs. Syphilis is often called the “great imitator” because its manifestations can resemble many other diseases.
Congenital syphilis occurs when infection is transmitted in utero. Infants may present with hepatosplenomegaly, rash, jaundice, and nasal discharge (“snuffles”), while older children may develop characteristic deformities such as Hutchinson teeth, saddle nose, and hearing loss.
Diagnosis relies primarily on serologic testing. Nontreponemal tests such as rapid plasma reagin (RPR) or Venereal Disease Research Laboratory (VDRL) are used for screening and monitoring treatment response, while treponemal tests such as fluorescent treponemal antibody absorption (FTA-ABS) confirm the diagnosis and remain positive for life. Dark-field microscopy can identify organisms in early lesions, and cerebrospinal fluid analysis is required when neurosyphilis is suspected.
Treatment is centered on penicillin, which remains the gold standard. Early stages are treated with a single intramuscular dose of benzathine penicillin G, while late latent disease requires multiple doses over several weeks. Neurosyphilis requires intravenous penicillin therapy. Patients allergic to penicillin, particularly pregnant women, should undergo desensitization. A Jarisch–Herxheimer reaction, characterized by fever and worsening symptoms shortly after treatment, may occur but is self-limited.
Follow-up is essential to ensure treatment success, with serial monitoring of antibody titers over time. Sexual partners should be tested and treated as necessary, and patients should also be screened for other sexually transmitted infections, including HIV. Early recognition and treatment are critical to prevent progression to late-stage disease and its serious complications.
Syphilis is a sexually transmitted infection caused by the spirochete bacterium Treponema pallidum. It is acquired through contact with infected mucous membranes or disrupted skin and remains a significant global health issue, with millions of new cases diagnosed annually. The disease progresses through distinct stages—primary, secondary, latent, and tertiary—each with characteristic clinical features.
Primary syphilis typically presents after an incubation period of about three weeks. The hallmark lesion is a painless chancre at the site of inoculation, which appears as a clean-based, well-demarcated ulcer, usually on the genitalia, rectum, or oral mucosa. Regional lymphadenopathy is common, and the lesion heals spontaneously within three to six weeks, often leading to missed diagnosis if not recognized early.
Secondary syphilis develops several weeks after the primary stage due to hematogenous dissemination of the organism. It is characterized by a diffuse, symmetric rash that often involves the palms and soles, a key diagnostic clue. Lesions may be maculopapular, papular, or polymorphic. Other features include mucous patches, condyloma lata (broad, moist, highly infectious lesions in intertriginous areas), generalized lymphadenopathy, and systemic symptoms such as fever, malaise, sore throat, and weight loss. Less common findings include patchy “moth-eaten” alopecia and ocular or neurologic involvement. This stage also resolves spontaneously if untreated.
Following resolution of secondary symptoms, the disease enters a latent phase, during which patients are asymptomatic but serologically positive. Early latent syphilis remains potentially infectious, while late latent syphilis is generally not, except in pregnancy where vertical transmission can occur. Without treatment, a subset of patients progress to tertiary syphilis years to decades later.
Tertiary syphilis is a destructive phase that may involve multiple organ systems. Neurosyphilis is the most common manifestation and can present with meningitis, cranial nerve deficits, dementia, or tabes dorsalis, which involves degeneration of the spinal cord leading to sensory loss and gait abnormalities. Cardiovascular syphilis may cause aortic aneurysm or aortic valve insufficiency. Gummatous syphilis results in granulomatous lesions affecting skin, bone, or internal organs. Syphilis is often called the “great imitator” because its manifestations can resemble many other diseases.
Congenital syphilis occurs when infection is transmitted in utero. Infants may present with hepatosplenomegaly, rash, jaundice, and nasal discharge (“snuffles”), while older children may develop characteristic deformities such as Hutchinson teeth, saddle nose, and hearing loss.
Diagnosis relies primarily on serologic testing. Nontreponemal tests such as rapid plasma reagin (RPR) or Venereal Disease Research Laboratory (VDRL) are used for screening and monitoring treatment response, while treponemal tests such as fluorescent treponemal antibody absorption (FTA-ABS) confirm the diagnosis and remain positive for life. Dark-field microscopy can identify organisms in early lesions, and cerebrospinal fluid analysis is required when neurosyphilis is suspected.
Treatment is centered on penicillin, which remains the gold standard. Early stages are treated with a single intramuscular dose of benzathine penicillin G, while late latent disease requires multiple doses over several weeks. Neurosyphilis requires intravenous penicillin therapy. Patients allergic to penicillin, particularly pregnant women, should undergo desensitization. A Jarisch–Herxheimer reaction, characterized by fever and worsening symptoms shortly after treatment, may occur but is self-limited.
Follow-up is essential to ensure treatment success, with serial monitoring of antibody titers over time. Sexual partners should be tested and treated as necessary, and patients should also be screened for other sexually transmitted infections, including HIV. Early recognition and treatment are critical to prevent progression to late-stage disease and its serious complications.
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