Syphilis crisis in the United States: Syphilis and congenital syphilis cases have been surging nationwide, with an 80% increase in total syphilis cases between 2018 and 2022. Serologic testing is the primary means of diagnosing, staging, and managing syphilis. Testing should be done for any sexually active patient in whom syphilis is suspected or who has new, unexplained symptoms. Prompt diagnosis and treatment of syphilis can prevent systemic complications, including ocular involvement and permanent blindness.

Syphilis is a sexually transmitted infection (STI) caused by the spirochete bacterium Treponema pallidum. It is characterized by a chronic intermittent clinical course. Treponema pallidum is transmitted person to person via direct contact with a syphilis ulcer during vaginal, anal, or oral sex and may enter through skin or mucous membranes. Hence, the locations for syphilitic ulcers include the vagina, cervix, anus, rectum, lips, hands, and inside of the mouth.

In the primary stage of syphilis, a painless ulceration, or chancre, typically appears about 21 days after initial infection, often preceded by a firm, painless papule. The chancre may be difficult to observe if located in the vagina or on the cervix. The entire genital area is susceptible, including the anus and inside the urethra. Chancres are typically asymptomatic. If secondary erosion or fissuring occurs, they may be painful. Other symptoms may include bloody stool and rectal pain.

Chancres vary in size from a few millimeters to several centimeters. They have an incubation period of 10-90 days (average 21 days). The chancre lasts 3-6 weeks and heals spontaneously.

All patients with primary syphilis will go on to develop secondary syphilis if the condition is left untreated. Secondary syphilis usually appears 3-10 weeks after the primary chancre and is characterized by a papulosquamous eruption and mucosal involvement, in some cases. Tertiary syphilis may appear months to years after secondary syphilis resolves and can involve the central nervous system (CNS), heart, bones, and skin.

Ocular screening (eg, slit lamp examination) is advised for patients with suspected or proven syphilis.

Immunocompromised patient considerations: Genital ulcers caused by syphilis increase the risk of HIV transmission due to epithelial barrier compromise and increased numbers of macrophages and T-lymphocytes with HIV-specific receptors.

HIV infection can alter the clinical presentation of syphilis. Manifestations include multiple chancres, atypical cutaneous eruptions, increased severity of organ involvement (such as hepatitis and glomerulonephritis), and rapidly developing arteritis and neurosyphilis. Neurosyphilis can occur at any stage of syphilis.

Related topics: ocular syphilis, endemic syphilis