<p>The aim of England’s National Chlamydia Screening Programme (NCSP) is to reduce the health harms caused by untreated chlamydia infection in women by ensuring all eligible women under the age of 25 years old are offered a chlamydia test.</p><p>UK Health Security Agency works with providers and commissioners of sexual and reproductive health services to implement the NCSP, monitor levels of chlamydia testing and diagnoses through our national surveillance systems and evaluate the impact of chlamydia screening on health outcomes.</p>