1. Centers for Disease Control and Prevention, USA. https://www.cdc.gov/std/chlamydia/stdfact-chlamydia.htm
2. European Centre for Disease Control and Prevention. https://www.ecdc.europa.eu/sites/portal/files/media/en/publications/Publications/chlamydia-control-europe-guidance.pdf
3. Family Planning Association, UK. https://www.sexwise.fpa.org.uk/stis/chlamydia
4. Healthtalk, UK. http://www.healthtalk.org/young-peoples-experiences/sexual-health/chlamydia
5. Mayo Clinic, USA. https://www.mayoclinic.org/diseases-conditions/chlamydia/diagnosis-treatment/drc-20355355