Hepatitis B Surveillance in South Australia
Hepatitis B Medical Notification 01/04/00 - 30/06/00
During the second quarter of 2000, 80
hepatitis B medical notifications were received. Of these, nine were acute
clinical cases of hepatitis B infection (Tables 3.1,
3.2). A further 13 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 58 cases (Table
3.3).
Exposure categories identified for the
nine acute clinical cases were injecting drug use (4), injecting drug use
and tattoos (1), overseas travel (1) and unknown risk factors (3) (Table
3.1).
Of the 58 reports of antigen positivity
of uncertain duration, 34 tested surface antigen positive for the first
time this quarter and the testing history was unknown for the remaining 24
cases. Among the 34 individuals who tested surface antigen positive for
the first time, but were not acute cases, the racial origin of 19 (56%)
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, 01/04/00 - 30/06/00 and year to date.
Exposure category by sex.
|
Exposure category
|
2nd Quarter
01/04/00 - 30/06/00 |
Year to date
01/01/00 - 30/06/00 |
|
Male |
Female |
Male |
Female |
Total |
|
IDU |
2 |
2 |
2 |
2 |
4 |
|
IDU/tattoos |
- |
1 |
- |
1 |
1 |
|
Overseas travel |
- |
1 |
1 |
1 |
2 |
|
None identified |
3 |
- |
3 |
- |
3 |
|
Total |
5 |
4 |
6 |
4 |
10 |
Table 3.2 Acute hepatitis B
infection, 01/04/00 - 30/06/00 and year to date.
Age group by sex.
|
Age group (years)
|
2nd Quarter
01/04/00 - 30/06/00 |
Year to date
01/01/00 - 30/06/00 |
|
Male |
Female |
Male |
Female |
Total |
|
10 - 19 |
- |
1 |
- |
1 |
1 |
|
20 - 29 |
1 |
1 |
2 |
1 |
3 |
|
30 - 39 |
1 |
1 |
1 |
1 |
2 |
|
40 - 49 |
1 |
- |
1 |
- |
1 |
|
³ 50 |
2 |
1 |
2 |
1 |
3 |
|
Total |
5 |
4 |
6 |
4 |
10 |
Table 3.3 Hepatitis B
infection, 01/04/00 - 30/06/00 and year to date.
Case category by sex.
|
Case category
|
2nd Quarter
01/04/00 - 30/06/00 |
Year to date
01/01/00 - 30/06/00 |
|
Male |
Female |
Male |
Female |
Total |
|
Acute Infection |
5 |
4 |
6 |
4 |
10 |
|
Antigen positive - |
|
|
|
|
|
|
uncertain duration |
35 |
23 |
56 |
45 |
101 |
|
Chronic carriers - |
|
|
|
|
|
|
>12 months duration |
7 |
6 |
13 |
10 |
23 |
|
Total |
47 |
33 |
75 |
59 |
134 |
Table 3.4 Individuals who
tested hepatitis B surface antigen positive for the first time, 01/04/00 -
30/06/00 and year to date.
Race by sex.
|
Racial origin |
2nd Quarter
01/04/00 - 30/06/00 |
Year to date
01/01/00 - 30/06/00 |
|
Male |
Female |
Male |
Female |
Total |
|
Aboriginal |
2 |
- |
2 |
2 |
4 |
|
Asian |
9 |
10 |
16 |
17 |
33 |
|
Caucasian |
8 |
2 |
13 |
3 |
16 |
|
Other/Unknown |
3 |
- |
3 |
1 |
4 |
|
Total |
22 |
12 |
34 |
23 |
57 |
Table 3.5 Summary of hepatitis
B surface antigen tests, 01/04/00 - 30/06/00 and year to date.
Laboratory by sex.
|
Laboratory
|
2nd Quarter
01/04/00 - 30/06/00 |
Cumulative
01/01/00 - 30/06/00 |
|
Male |
Female |
Unknown |
Male |
Female |
Unknown |
Total |
|
Public |
4720 |
6657 |
20 |
9671 |
13653 |
116 |
|
|
Private |
4026 |
5068 |
- |
8566 |
11047 |
- |
|
|
Total |
8746 |
11725 |
20 |
18237 |
24700 |
116 |
|
|
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