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Quarterly Surveillance Report 1999 No. 3: July-September
Hepatitis B Surveillance in South Australia

Hepatitis B Medical Notification 01/07/99 - 30/09/99

During the third quarter of 1999, 69 hepatitis B medical notifications were received. Of these, four were acute clinical cases of hepatitis B infection (Tables 3.1, 3.2). A further 14 were reports of chronic carriers of greater than twelve months duration, who had been previously diagnosed but not notified. There was one report of antigen positivity of less than 12 months duration (defined by a negative hepatitis B surface antigen test in the 12 months prior to diagnosis) (Table 3.3). Reports of antigen positivity of uncertain duration accounted for 50 cases (Table 3.3).

Of the 50 reports of antigen positivity of uncertain duration, 30 tested surface antigen positive for the first time this quarter, one case had a previous negative test and the testing history was unknown for the remaining 19 cases. Among the 30 individuals who tested surface antigen positive for the first time, but were not acute cases, the racial origin of 15 (50%) was reported as Caucasian and 13 (43%) as Asian (Table 3.4).

The number of hepatitis B surface antigen tests performed by laboratories for this quarter is shown in Table 3.5.

Table 3.1 Acute hepatitis B infection, 01/07/99 - 30/09/99 and year to date. Exposure category by sex.

Table 3.2 Acute hepatitis B infection, 01/07/99 - 30/09/99 and year to date. Age group by sex.

Table 3.3 Hepatitis B infection, 01/07/99 - 30/09/99 and year to date. Case category by sex.

Table 3.4 Individuals who tested hepatitis B surface antigen positive for the first time, 01/07/99 - 30/09/99 and year to date. Race by sex.

Table 3.5 Summary of hepatitis B surface antigen tests, 01/07/99 - 30/09/99 and year to date. Laboratory by sex.

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