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Hepatitis B Surveillance in South Australia: QSR 1999 No. 14

Hepatitis B Medical Notification 01/10/99 - 31/12/99

During the fourth quarter of 1999, 62 hepatitis B medical notifications were received. Of these, five were acute clinical cases of hepatitis B infection (Tables 3.1, 3.2). A further 11 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 46 cases (Table 3.3).

Of the 46 reports of antigen positivity of uncertain duration, 34 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 11 cases. Among the individuals who tested surface antigen positive for the first time, but were not acute cases, the racial origin of 16 (47%) was reported as Asian and 14 (41%) as Caucasian (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, 01/10/99 - 31/12/99 and year to date. Exposure category by sex.

Table 3.2 Acute hepatitis B infection, 01/10/99 - 31/12/99 and year to date. Age group by sex.

Table 3.3 Hepatitis B infection, 01/10/99 - 31/12/99 and year to date. Case category by sex.

Table 3.4 Individuals who tested hepatitis B surface antigen positive for the first time, 01/10/99 - 31/12/99 and year to date. Race by sex.

Table 3.5 Summary of hepatitis B surface antigen tests, 01/10/99 - 31/12/99 and year to date. Laboratory by sex.

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