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Hepatitis B Surveillance in South Australia

Hepatitis B Medical Notification 01/07/00 - 30/09/00

During the third quarter of 2000, 82 hepatitis B medical notifications were received. Of these, 11 were acute clinical cases of hepatitis B infection (Tables 3.1, 3.2). A further 16 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 55 cases (Table 3.3).

Exposures identified for the 11 acute clinical cases were injecting drug use (4), overseas travel (1), heterosexual contact (3), social/family contact (1) and unknown risk factors (2) (Table 3.1).

Of the 55 reports of antigen positivity of uncertain duration, 31 tested surface antigen positive for the first time this quarter, one had a previous negative test and the testing history was unknown for the remaining 23 cases. Among the 31 individuals who tested surface antigen positive for the first time, but were not acute cases, the racial origin of 18 (58%) 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, 01/07/00 - 30/09/00 and year to date. Exposure category by sex.

Exposure category	3rd Quarter 01/07/00 - 30/09/00		Year to date 01/01/00 - 30/09/00
	Male	Female	Male	Female	Total
IDU	4	-	6	3	9
Heterosexual contact	-	3	-	3	3
Overseas travel	1	-	2	1	3
Social/family	1	-	1	-	1
None identified	1	1	4	1	5
Total	7	4	13	8

Table 3.2 Acute hepatitis B infection, 01/07/00 - 30/09/00
and year to date. Age group by sex.

Age group (years)	3rd Quarter 01/07/00 - 30/09/00		Year to date 01/01/00 - 30/09/00
	Male	Female	Male	Female	Total
10 - 19	-	1	-	2	2
20 - 29	3	1	5	2	7
30 - 39	3	-	4	1	5
40 - 49	1	1	2	1	3
>49	-	1	2	2	4
Total	7	4	13	8	21

Table 3.3 Hepatitis B infection, 01/07/00 - 30/09/00
and year to date. Case category by sex.

Case category	3rd Quarter 01/07/00 - 30/09/00		Year to date 01/01/00 - 30/09/00
	Male	Female	Male	Female	Total
Acute Infection	7	4	13	8	21
Antigen positive -	37	18	96	65	161
uncertain duration
Chronic carriers -	10	6	23	17	40
>12 months duration
Total	54	28	132	90	222

Table 3.4 Individuals who tested hepatitis B surface antigen positive for the first time, 01/07/00 - 30/09/00 and year to date. Race by sex.

Racial origin	3rd Quarter 01/07/00 - 30/09/00		Year to date 01/01/00 - 30/09/00
	Male	Female		Male	Female	Total
Aboriginal	-	-		4	2	6
Asian	11	7		27	25	52
Caucasian	6	3		20	6	26
Other/Unknown	2	2		4	3	7
Total

Table 3.5 Summary of hepatitis B surface antigen tests,
01/07/00 - 30/09/00 and year to date. Laboratory by sex.

Laboratory	3rd Quarter 01/07/00 - 30/09/00			Cumulative 01/01/00 - 30/09/00
	Male	Female	Unknown		Male	Female	Unknown	Total
Public	4811	5204	72		14482	18857	264	33603
Private	3642	5322	-		12208	16369	-	28577
Total			72				264

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