Sexual Health

Changes in Clinic-Level STI Burden After Doxycycline Post-Exposure Prophylaxis Implementation in an Urban Sexual Health Clinic.

Jarolimova J, Bassett I, et al. • Sexually transmitted diseases • 2025

PubMed 40525823 DOI 10.1097/OLQ.0000000000002206

TL;DR

Implementation of doxycycline post-exposure prophylaxis (doxyPEP) in an urban sexual health clinic was associated with a subsequent decrease in clinic-level chlamydia and syphilis positivity, but no change in overall gonorrhea positivity.

Key Findings

Results

A substantial portion of the clinic population initiated doxyPEP within the first 12 months of implementation.

The study was conducted at an urban sexual health clinic.
DoxyPEP implementation occurred and uptake was tracked over the first 12 months following introduction.
The proportion of the clinic population initiating doxyPEP was described as 'substantial.'

Results

DoxyPEP implementation was associated with a decrease in clinic-level chlamydia positivity.

The decrease in chlamydia positivity was observed at the clinic level following doxyPEP implementation.
This finding was based on data from an urban sexual health clinic population.
The association was identified in the period subsequent to doxyPEP implementation.

Results

DoxyPEP implementation was associated with a decrease in clinic-level syphilis positivity.

The decrease in syphilis positivity was observed at the clinic level following doxyPEP implementation.
This finding was based on data from an urban sexual health clinic population.
The association was identified in the period subsequent to doxyPEP implementation.

Results

DoxyPEP implementation was not associated with a change in overall gonorrhea positivity at the clinic level.

No change in overall gonorrhea positivity was detected following doxyPEP implementation.
This is consistent with known reduced efficacy of doxycycline against Neisseria gonorrhoeae, particularly due to tetracycline resistance.
The finding was assessed at the clinic population level in the same urban sexual health clinic setting.

What This Means

This research suggests that when a large urban sexual health clinic began offering doxycycline post-exposure prophylaxis (doxyPEP) — an antibiotic that people can take after potential exposure to sexually transmitted infections (STIs) — a meaningful share of patients started using it within the first year. Researchers then looked at whether this uptake was associated with changes in the rates of common bacterial STIs diagnosed at the clinic. They found that rates of chlamydia and syphilis infections detected at the clinic went down after doxyPEP became available, while gonorrhea rates did not change. The finding that gonorrhea did not decrease is notable and aligns with scientific understanding that the bacteria causing gonorrhea are often resistant to doxycycline, making the antibiotic less effective against it compared to chlamydia and syphilis. This means doxyPEP appears to have a differential effect depending on the type of STI. This research matters because it provides real-world, clinic-level evidence that doxyPEP rollout may contribute to reductions in certain STIs at a population scale, not just among individuals who use it. It also highlights that gonorrhea remains a challenge that doxyPEP alone may not address, underscoring the need for continued monitoring of STI trends and antibiotic resistance as doxyPEP programs expand.

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Citation

Jarolimova J, Bassett I, Platt L, Germain C, Parker R, Ard K. (2025). Changes in Clinic-Level STI Burden After Doxycycline Post-Exposure Prophylaxis Implementation in an Urban Sexual Health Clinic.. Sexually transmitted diseases. https://doi.org/10.1097/OLQ.0000000000002206

Key Findings

What This Means

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