Skip to main content
hpa logo
Topics A-Z:
Search the site:
Home Topics Infectious Diseases Infections A-Z HIV HIV Surveillance Systems

HIV Surveillance Systems

Surveillance scientist at work

This page summarises the different HIV surveillance systems through the use of a metadata file that includes FAQs.


HIV data image

HIV and AIDS Reporting System (HARS)

A new data system, the HIV and AIDS Reporting System (HARS), has been developed by Public Health England. This system will eventually replace the reporting of SOPHID and new HIV diagnoses. The HARS dataset has been designed to collect data to enhance public health surveillance outputs and support commissioning and is under active implementation.

›› The HIV and AIDS Reporting System (HARS) 



Survey of Prevalent HIV Infections Diagnosed (SOPHID)

Public Health England collects information from all those living with a diagnosed HIV infection and accessing care at NHS services in England, Wales and Northern Ireland. The Survey of Prevalent HIV Infection (SOPHID) data are used to plan services, monitor the quality of care received by patients and their clinical outcomes.

››  SOPHID metadata files (PDF, 135 KB) 


New HIV Diagnoses logo

HIV & AIDS New Diagnoses Database (HANDD)

Reports of new HIV diagnoses, AIDS and Deaths are received from clinicians and microbiologists. Data contribute to understanding of HIV transmission and are used to monitor exposure to HIV.

››  HANDD metadata files (PDF, 109 KB) 


HIV incidence

Recent Infection Testing Algorithm (RITA)

The Recent HIV Infection Testing Algorithm programme monitors the number of patients who recently acquired HIV infection at the time of diagnosis. Data are used to help understand trends in HIV transmission.

››  RITA metadata files (PDF, 100 KB) 


CD4 Cell data logo 

CD4 Surveillance Scheme

The National CD4 Surveillance scheme monitors trends in immunosuppression associated with HIV infection by collecting data on CD4 T-lymphocyte (CD4 cell) counts performed by laboratories in England and Wales. Data are used to calculate late HIV diagnoses, access to HIV care and the clinical outcomes of those living with HIV.

››  CD4 surveillance metadata files (PDF, 111 KB) 

CD4 data have been used to model and provide estimates of CD4 decline among drug naïve HIV diagnosed persons who have a known HIV seroconversion date.

››  Longitudinal analysis of the trajectories of CD4 cell counts (PDF, 282 KB)