Effectiveness of syphilis partner notification after adjusting for treatment dates, 7 jurisdictions.

INTRODUCTION Disease intervention specialists (DIS) prevent syphilis by assuring treatment for patients' sex partners through partner notification (PN). Different interpretations of how to measure partners treated due to DIS efforts complicates PN evaluation. We measured PN impact by counting partners treated for syphilis after DIS interviewed the patient. METHODS We reviewed data from early syphilis cases reported during 2015-2017 in seven jurisdictions. We compared infected partners brought to treatment using: 1) DIS-assigned disposition codes or 2) all infected partners treated 0-90 days after the patient's interview (adjusted treatment estimate). Stratified analyses assessed patient characteristics associated with the adjusted treatment estimate. RESULTS DIS interviewed 23,613 patients who reported 20,890 partners with locating information. Many of the 3,569 (17.1%) partners classified by DIS as brought to treatment were treated before the patient was interviewed. There were 2,359 (11.3%) partners treated 0-90 days after the patient's interview. Treatment estimates were more consistent between programs when measured using our adjusted estimates (range 6.1%-14.8% per patient interviewed) compared to DIS-assigned disposition (range 6.1%-28.3%). Treatment of >1 partner occurred after 9.0% of interviews and was more likely if the patient was a woman (17.9%), aged <25 years (12.6%), interviewed ≤7 days from diagnosis (13.9%), HIV negative (12.6%), or had no reported history of syphilis (9.8%). CONCLUSIONS Counting infected partners treated 0-90 days after interview reduced variability in reporting and facilitates quality assurance. Identifying programs and DIS who are particularly good at finding and treating partners could improve program impact.