An STI upsurge requires a nimble approach to care

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doi:doi: 10.12788/jfp.0641

Applied Evidence

An STI upsurge requires a nimble approach to care

J Fam Pract. 2023 July;72(6):E1-E12 | doi: 10.12788/jfp.0641

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References

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Since reaching a historic nadir of incidence in 2000 (5979 cases in the United States), there has been an increasingly rapid rise in that number: to 130,000 in 2020. More than 50% of cases are in MSM; however, the number of cases in heterosexual women is rapidly increasing.⁴³

Routine screening for syphilis should be performed in any person who is at risk: all pregnant women in the first trimester (and in the third trimester and at delivery if they are at risk or live in a community where prevalence is high) and annually in sexually active MSM or anyone with HIV infection.¹⁰

Diagnosis. Examination by dark-field microscopy, testing by PCR, and direct fluorescent antibody assay for T pallidum from lesion tissue or exudate provide definitive diagnosis for early and congenital syphilis, but are often unavailable.

Presumptive diagnosis requires 2 serologic tests:

Nontreponemal tests (the VDRL and rapid plasma reagin tests) identify anticardiolipin antibodies released during syphilis infection, although results also can be elevated in autoimmune disease or after certain immunizations, including the COVID-19 vaccine.
Treponemal tests (the fluorescent treponemal antibody absorbed assay, T pallidum particulate agglutination assay, enzyme immunoassay, and chemiluminescence immunoassay) are specific antibody tests.

Historically, reactive nontreponemal tests, which are less expensive and easier to perform, were followed by a treponemal test to confirm the presumptive diagnosis. This method continues to be reasonable when screening patients in a low-prevalence population.¹¹ The reverse sequence screening algorithm (ie, begin with a treponemal test) is now frequently used. With this method, a positive treponemal test must be confirmed with a nontreponemal test. If the treponemal test is positive and the nontreponemal test is negative, another treponemal test must be positive to confirm the diagnosis. This algorithm is useful in high-risk populations because it provides earlier detection of recently acquired syphilis and enhanced detection of late latent syphilis.^12,13,44 The CDC has not stated a diagnostic preference.

Once the diagnosis is made, a complete history (including a sexual history and a history of syphilis testing and treatment) and a physical exam are necessary to confirm stage of disease.⁴⁵

Special circumstances. Neurosyphilis, ocular syphilis, and otosyphilis refer to the site of infection and can occur at any stage of disease. The nervous system usually is infected within hours of initial infection, but symptoms might take weeks or years to develop—or might never manifest. Any time a patient develops neurologic, ophthalmologic, or audiologic symptoms, careful neurologic and ophthalmologic evaluation should be performed and the patient should be tested for HIV.

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