在资源丰富的国家中，生殖系统衣原体是最常见的细菌性性传播感染。[3]Workowski KA, Bolan GA; Centers for Disease Control and Prevention. Sexually transmitted diseases treatment guidelines, 2015. MMWR Recomm Rep. 2015 Jun 5;64(RR-03):1-137.http://www.cdc.gov/mmwr/preview/mmwrhtml/rr6403a1.htmhttp://www.ncbi.nlm.nih.gov/pubmed/26042815?tool=bestpractice.com[4]Centers for Disease Control and Prevention. Sexually transmitted disease surveillance 2017. September 2018 [internet publication].https://www.cdc.gov/std/stats17/default.htm[5]Swedish Institute for Infectious Disease Control. Chlamydia infection. Swedish Institute for Infectious Disease Control; 2007. 2017 年，英格兰共计诊断 203,116 例衣原体感染，占到全部新确诊的性传播感染的 48%。[6]Public Health England. Sexually transmitted infections and chlamydia screening in England, 2017. June 2018 [internet publication].https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/713944/hpr2018_AA-STIs_v5.pdf
2017 年，美国疾病预防控制中心报告的衣原体感染病例为 1,708,569 例。[4]Centers for Disease Control and Prevention. Sexually transmitted disease surveillance 2017. September 2018 [internet publication].https://www.cdc.gov/std/stats17/default.htm 即每 10 万人口中有 528.8 例，与 2016 年相比增长了 6.9%。大多数报告的感染发生在 15-24 岁之间。[4]Centers for Disease Control and Prevention. Sexually transmitted disease surveillance 2017. September 2018 [internet publication].https://www.cdc.gov/std/stats17/default.htm
