Epidemiology

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Diagnose, behandeling, opvolging en doorverwijzing van infecties met Chlamydia trachomatis (CT) in de eerste lijnPublished by: Werkgroep Ontwikkeling Richtlijnen Eerste Lijn (Worel)Last published: 2025Diagnostic, traitement, suivi et renvoi des infections à Chlamydia trachomatis (CT) en soins primairesPublished by: Groupe de Travail Développement de recommmandations de première ligneLast published: 2025

In 2020, there were an estimated 128.5 million incident chlamydia infections worldwide among adults aged 15-49 years.[3]​ Genital chlamydia is the most common bacterial STI in resource-rich countries.[2][4][5]​​​​ In the US, in 2023, there were 1,648,568 chlamydial infections reported to the Centers for Disease Control and Prevention. This is a rate of 492.2 cases per 100,000 population, which is similar to the rate of 495.0 cases per 100,000 population in 2022. Between 2022 and 2023, the rates of reported chlamydia increased 1.3% (from 363.7 to 368.3 per 100,000) among men and decreased 1.7% (from 621.2 to 610.7 per 100,000) among women. The overall reduction in the number of reported cases of chlamydia since 2019 (552.8 cases per 100,000 population) reflects a persistent disruption in chlamydia screening coverage because of the COVID-19 pandemic. Most reported infections in the US occur among 15-24 year olds (55.8% in 2022).[4] In 2019, in the UK there were 134,418 diagnoses of chlamydia in this age group, which is equivalent to a detection rate of 2043 cases per 100,000 population.[6]

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