The epidemiology of tuberculosis in New South Wales 1975-1995: the effects of immigration in a low prevalence population

T. C. Heath, C. Roberts, M. Winks, A. G. Capon

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Abstract

SETTING: New South Wales (NSW) is Australia's most populous state and is home to one third of the country's rapidly growing immigrant population. OBJECTIVE: To examine the effects of immigration upon the epidemiology of tuberculosis (TB) in a low prevalence population. DESIGN: A retrospective review of state TB surveillance data in NSW from 1975-1995. RESULTS: The crude notification rate for all active TB declined from 12.2 per 100 000 population in 1975 to 5.2/100 000 in 1986, after which the notification rate increased steadily to 7.6/100000 in 1995. Between 1975 and 1995, the proportion of all TB notifications occurring in overseas-born residents increased from 30% (178/601) to 79% (345/435). During this period, the proportion of new extra-pulmonary TB notifications increased from 13% (72/549) to 42% (171/405). Notifications amongst women increased from 31% (188/601) to 47% (218/462) of the total, while the median age at notification fell from 55 to 41 years. The pattern of TB disease has not changed for Australian-born cases, who are mostly elderly men with pulmonary disease. Multidrug-resistant TB remains uncommon (<1%), and co-infection with the human immunodeficiency virus (HIV) and TB has not emerged as a major problem (2% of notifications), but is poorly documented. CONCLUSION: TB has re- emerged in NSW predominantly because of increased immigration from high prevalence countries. The epidemiology of TB has become dominated by overseas-born notifications, and now younger adults are primarily affected. Enhancing the effectiveness of the TB screening procedures for immigrants is a priority. Information should be provided to all immigrants and to long- term visitors from countries of high TB prevalence regarding TB infection and the TB services available in Australia.

Original languageEnglish
Pages (from-to)647-654
Number of pages8
JournalInternational Journal of Tuberculosis and Lung Disease
Volume2
Issue number8
Publication statusPublished - 31 Aug 1998
Externally publishedYes

Keywords

  • Immigrant screening
  • Immigration
  • Low prevalence
  • Surveillance
  • Tuberculosis

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