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Hepatitis B Surveillance in South Australia

Hepatitis B Medical Notification 01/04/01 - 30/06/01

During the second quarter of 2001, 70 hepatitis B medical notifications were received. Of these, three were acute clinical cases of hepatitis B infection (Tables 3.1, 3.2). A further eight were reports of chronic carriers of greater than twelve months duration, who had been previously diagnosed, but not notified (Table 3.3). Reports of antigen positivity of uncertain duration accounted for 59 cases (Table 3.3).

Exposure categories identified for the acute clinical cases were injecting drug use (1), heterosexual contact (1), and unknown risk factors (1) (Table 3.1).

Of the 59 reports of antigen positivity of uncertain duration, 37 tested surface antigen positive for the first time this quarter, one had a previous negative test and the testing history was unknown for the 21 remaining cases. Among the 37 individuals who tested surface antigen positive for the first time, but were not acute cases, the racial origin of 26 (70%) was reported 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, 01/04/01 - 30/06/01 and year to date. Exposure category by sex.

Table 3.2 Acute hepatitis B infection, 01/04/01 - 30/06/01 and year to date. Age group by sex.

Table 3.3 Hepatitis B infection, 01/04/01 - 30/06/01 and year to date.
Case category by sex.

Table 3.4 Individuals who tested hepatitis B surface antigen positive for the first time, 01/04/01 - 30/06/01 and year to date. Race by sex.

Table 3.5 Summary of hepatitis B surface antigen tests, 
01/04/01 - 30/06/01 and year to date. Laboratory by sex.

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