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Hepatitis B Surveillance in South Australia

Hepatitis B Medical Notification 01/01/01 - 31/03/01

During the first quarter of 2001, 80 hepatitis B medical notifications were received. Of these, 10 were acute clinical case of hepatitis B infection (Tables 3.1, 3.2). A further 21 were reports of chronic carriers of greater than twelve months duration, who had been previously diagnosed but not notified. Reports of antigen positivity of uncertain duration accounted for 47 cases (Table 3.3). There were two reports of antigen positivity of less than 12 months duration (defined by a negative hepatitis B antigen test in the 12 months prior to diagnosis) (Table 3.3).

Of the 47 reports of antigen positivity of uncertain duration, 27 tested surface antigen positive for the first time this quarter, two had previously tested positive interstate or overseas and the testing history was unknown for the remaining 18 cases. Among the 27 individuals who tested surface antigen positive for the first time, but were not acute cases, the racial origin of 14 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, 01/01/01 - 31/03/01. Exposure category by sex.

Table 3.2 Acute hepatitis B infection, 01/01/01 - 31/03/01. Age group by sex.

Table 3.3 Hepatitis B infection, 01/01/01 - 31/03/01. 
Case category by sex.

Table 3.4 Individuals who tested hepatitis B surface antigen positive for the first time, 01/01/01 - 31/03/01. Race by sex.

Table 3.5 Summary of hepatitis B surface antigen tests, 01/01/01 - 31/03/01. Laboratory by sex.

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