Chlamydia - Annual Epidemiological Report for 2023

European Centre for Disease Prevention and Control. Chlamydia. In: ECDC. Annual Epidemiological Report for 2023. Stockholm: ECDC; 2025.

Surveillance and monitoring
  • Publication series: Annual Epidemiological Report
  • Time period covered: This report is based on data for 2023 retrieved from The European Surveillance System (TESSy) on 31 October 2024.
For 2023, 230 199 confirmed cases of chlamydia infection were reported in 27 EU/EEA countries, with a crude notification rate of 70.4 cases per 100 000 population. When analysing the rate over time among countries reporting consistently, this represents a 3% increase in the crude notification rate compared to 2022, and a 13% increase compared to 2014.

Executive summary

• After reaching record-high notification rates in 2022, the increase in chlamydia notification rates slowed down in 2023 for both women and men.
• Notification rates continued to be highest among women aged 20−24 years in 2023, although a 2% decrease was observed in the rate for this population group compared to 2022.
• In 2023, transmission between men who have sex with men (MSM) accounted for 20% of chlamydia cases, an increase of 4% compared with 2022.
• National notification rates for cases of chlamydia infection ranged between 0.1 and 626 cases per 100 000 population. Differences in chlamydia testing policies, case finding strategies and reporting are considered to have a greater influence on reported chlamydia numbers than actual differences in epidemiology.

Publication file

Chlamydia - Annual Epidemiological Report for 2023

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