One Dose Antibiotic Treats Early Syphilis
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Single Syphilis Shot as Effective as Three, NIH Trial Finds
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(Last updated: September 3, 2025)
Researchers funded by the National Institutes of Health (NIH) have demonstrated that a single injection of the antibiotic benzathine penicillin G (BPG) is just as effective in treating early syphilis as the conventional three-injection regimen. The findings, published today in The New England Journal of Medicine, suggest that the second and third doses of conventional BPG therapy may not provide additional health benefits.
Rising Syphilis Rates & Treatment Challenges
Syphilis rates are increasing dramatically in the United States. In 2023, the U.S.reported 209,253 total syphilis cases and 3,882 congenital syphilis cases, representing 61% and 108% increases over 2019 numbers, respectively. This surge underscores the urgent need for effective and accessible treatment options.
“Benzathine penicillin G is highly effective against syphilis, but the three-dose regimen can be burdensome and deter people from attending follow-up visits with their healthcare providers,” said Carolyn Deal, Ph.D., chief of the enteric and sexually transmitted infections branch of NIH’s National Institute of Allergy and Infectious Diseases (NIAID). “The new findings offer welcome evidence for potentially simplifying treatment with an equally effective one-dose regimen, notably while syphilis rates remain alarmingly high.”
Understanding syphilis
Syphilis is a common sexually transmitted infection (STI) caused by the bacterium Treponema pallidum. Without treatment, syphilis can lead to serious health complications, including neurological and organ damage, severe pregnancy complications, congenital abnormalities in newborns, and an increased risk of acquiring or transmitting HIV.
The disease progresses through several stages:
- Primary Syphilis: Characterized by a painless sore called a chancre.
- Secondary Syphilis: May involve a rash,fever,and swollen lymph nodes.
- Early Latent Syphilis: No visible signs or symptoms, but the infection remains in the body.
Early diagnosis and treatment are crucial to prevent progression to later, more severe stages. More information on symptoms and stages can be found BPG Shortages & Treatment Access
BPG is a critical antibiotic for treating syphilis, but global Study Details
The clinical trial involved 249 participants with early syphilis (primary, secondary, or early latent stages) at ten U.S. sites. The participant demographics were as follows:
| Characteristic | Percentage |
|---|---|