• Open Access

Prevalence of chronic hepatitis B in South Western Sydney: evaluation of the country of birth method using maternal seroprevalence data

Authors


Correspondence to:
Ms Caroline Turnour, Centre for Aboriginal Health, NSW Department of Health, Locked Mail Bag 961, North Sydney, NSW 2059; e-mail: caroline.turnour@doh.health.nsw.gov.au

Abstract

Objective: To estimate the prevalence of hepatitis B infection and evaluate the country of birth (Census) method of describing hepatitis B distribution in an Australian health service with a large migrant population.

Methods: The prevalence of chronic hepatitis B in Sydney South West Area Health Service (SSWAHS, population 1.3 million) was estimated by applying the prevalence of hepatitis B surface antigen (HBsAg) in high or intermediate hepatitis B prevalence countries to SSWAHS residents from those countries, using 2006 Census data. The Australian hepatitis B prevalence (0.7%) was applied to the remainder. This method was validated using HBsAg seroprevalence in 42,274 women aged 15–44 years who delivered at SSWAHS public maternity hospitals during 2007 to 2009.

Results: The SSWAHS prevalence of HBsAg using the Census method was 2.0% for all ages and 2.3% for 15–44 year old women. The seroprevalence in 15–44 year old mothers was 1.8%. The adjusted population prevalence was 1.6%. The two methods produced broadly similar descriptions of relative hepatitis B burden by local government area and country of birth.

Conclusion: The Census method overestimates the prevalence of hepatitis B infection by 30%, but produces similar patterns of hepatitis B burden across the area. Health services can estimate the prevalence and distribution of chronic hepatitis B using readily available data to focus delivery of prevention and treatment services.

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