Epidemiology

In 2016, there were an estimated 127.2 million incident chlamydia infections worldwide.[3] Genital chlamydia is the most common bacterial STI in resource-rich countries.[2][4][5]​​ In the US, in 2022, there were 1,649,716 chlamydial infections reported to the Centers for Disease Control and Prevention. This is a rate of 495.0 cases per 100,000 population, which is similar to the rate of 495.5 cases per 100,000 population in 2021. Between 2021 and 2022, the rates of reported chlamydia increased 1.8% (from 357.4 to 363.7 per 100,000) among men and decreased 1.2% (from 628.8 to 621.2 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 (57.7% 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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