INTRODUCTION:
Sexually transmitted infections (STIs) remain a major public health problem worldwide due to their high transmissibility, which often surpasses the effectiveness of available prevention strategies¹˒². Expanding access to timely diagnosis and treatment is essential, especially for populations that face barriers to accessing health services¹. Large-scale events represent strategic opportunities for prevention, testing, and diagnosis actions for STIs³.

METHODS:
This descriptive study analyzed the occurrence of human immunodeficiency virus (HIV), syphilis, hepatitis B, and hepatitis C among individuals who underwent rapid testing through the Fique Sabendo strategy during the June festivities held in Salvador, Bahia, Brazil, in 2024. Secondary data from the Event Occurrence System (SOPE) were used. Sociodemographic variables analyzed included age, sex, race/color, and gender identity. Data were analyzed using descriptive statistics and the chi-square test.

RESULTS:
A total of 3,210 individuals were tested. Syphilis showed a statistically significant association with age, sex, and gender identity, being more prevalent among individuals aged 20 to 49 years and cisgender individuals (p < 0.001). For HIV, a significant association was observed only with gender identity (p = 0.0008), with higher positivity among cisgender individuals. No statistically significant associations were identified between sociodemographic variables and test results for hepatitis B and hepatitis C. Among individuals with a reactive syphilis test, 28.1% initiated immediate treatment.

CONCLUSIONS:
The Fique Sabendo strategy proved effective in expanding access to STI testing, diagnosis, and initiation of treatment in non-traditional settings. Conducting these actions during festive events contributes to early diagnosis and reaching vulnerable populations, reinforcing their importance for STI prevention and control within the public health context.