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Prevalent diagnosed HIV in England, Wales and Northern Ireland: adjusted totals 1996 to 2001 and extrapolations to 2004

Rice, Brian D; McHenry, Angela; Sinka, Katy; Payne, Lara JC; Baster, Kathleen; Patel, Bela; Evans, Barry G

Epidemiology & Social: Concise Communications

Objective: To predict trends in diagnosed HIV prevalence by extrapolation to 2004 using data from the annual surveys of individuals receiving HIV-related care in England, Wales and Northern Ireland from 1996 to 2001.

Methods: Data from the annual surveys of prevalent HIV infections diagnosed (SOPHID) were adjusted for under-reporting and non-attendance and separately extrapolated for infections acquired homosexually, heterosexually and by other routes. The data were extrapolated using negative binomial and linear regression models based on the 1996 to 2001 annual surveys.

Results: The negative binomial model predicted an increase of 56% in diagnosed HIV prevalence in England, Wales and Northern Ireland between 2001 and 2004. The linear model predicted an increase of 25% for the same time period. The predicted increases are mostly driven by the large rise in the number of new diagnoses, in particular in individuals infected heterosexually.

Conclusion: Increases in HIV prevalence in England, Wales and Northern Ireland have diverged from a linear trend. Negative binomial modelling of the data predicts that large rises in prevalence will continue during the early 2000s.

From the Communicable Disease Surveillance Centre, Health Protection Agency, London, UK.

Correspondence to Brian Rice, MSc, HIV and STI Division, CDSC, Health Protection Agency, 61 Colindale Avenue, Colindale, London, NW9 5EQ, UK.

Tel: +44 (0) 20 8200 6868 ext. 4420; fax: +44 (0) 20 8200 7868; e-mail: brian.rice@hpa.org.uk

Received: 31 July 2003; revised: 12 November 2003; accepted: 8 December 2003.

© 2004 Lippincott Williams & Wilkins, Inc.