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SEXUALLY TRANSMITTED DISEASES CONTROL BRANCH
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Syphilis

SyphilisSyphilis is a sexually transmitted infection (STI) caused by the bacterium Treponema pallidum. Untreated infection can lead to long-term health problems, including brain disease. Syphilis increases both transmission and acquisition of HIV. Tests and treatment are available.

Information on congenital syphilis.

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**Please note, the STI treatment guidelines referenced in this document are out of date. Please refer to the 2021 STI Treatment guidelines for the current treatment regimens.
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