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About

The CTAD Chlamydia Surveillance System is the mandatory surveillance system forÌýchlamydiaÌýand collects data on all publicly commissioned chlamydia testing from laboratories in England. CTAD is an electronic, pseudonymised and depersonalised data set.

The UK Health Security Agency (UKHSA) uses chlamydia data from CTAD and theÌý³Ò±«²Ñ°ä´¡¶ÙÌýSTIÌýSurveillance SystemÌýto report chlamydia testing activity and to monitor the National Chlamydia Screening Programme (NCSP).

How to submit CTAD data

Technical guidance and data set specifications are available at:

CTAD specification and technical guidance

Guidance on data submission requirements for services providing self-sampling tests for sexually transmitted infections (STIs) can be found at:

GUMCAD andÌýCTAD data submission forÌýSTIÌýself-sampling services

When to submitÌýCTADÌýdata

Where to access chlamydia surveillance data

Chlamydia surveillance data is subject to strict data sharing and publication rules (particularly regarding small numbers) outlined in theÌýUKHSAÌýHIVÌýandÌýSTIÌýdata publication guidelines.

Information onÌýchlamydia tests and diagnoses in England is available in a variety of outputs.

National Chlamydia Screening Programme annual data tables

These present information onÌýchlamydia testing and diagnoses in people aged 15 to 24 years in England by demographic characteristics and geographical region.

These provide local authority area data on STI andÌýHIVÌýdiagnoses and services through interactive maps and charts.

These are restricted-access reports for monitoring local, regional and national chlamydia screening trends. They are accessible to registered NHS and local authority users only.

Sexual health, reproductive health andÌýHIVÌýin England

This guide is to help local government, service providers and commissioners understand the sexual and reproductive health data available across England and how the data can be accessed.

CTAD data requestsÌý

Aggregate CTAD data can be requested by completing theÌýCTAD data request formÌýand sending this toÌýctad@ukhsa.gov.ukÌý

Data requests may take 20 working days to complete (they may take longer during busy periods).

UKHSAÌýsexual health andÌýHIVÌýprivacy information

UKHSA’s sexual health andÌýHIVÌýprivacy informationÌýexplains the de-personalised data we collect, how we use it and how we protect this information.

Contact information

For further information or to request access to theÌý, please contact the CTAD team atÌýctad@ukhsa.gov.uk