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National Notifiable Diseases Surveillance System, 2004
Annual report
Figure 27. Notification rates of chlamydial
infections, Australia, 2004, by age group and sex
Rate per 100,000 population
1400
1200
1000
800
600
400
200
0
0-4
5-9
10-14
15-19
20-24
25-29
30-34
35-39
40-44
45-49
50-54
55-59
60-64
65-69
70-74
75-79
80-84
85+
Age group (years)
Male
Female
Figure 28. Trends in notification rates of
chlamydial infection in persons aged 10–39 years,
Australia, 2000 to 2004, by age group and sex
Rate per 100,000 population
1300
1200
10 to 14
1100
15 to 19
1000
20 to 24
900
25 to 29
800
30 to 34
700
35 to 39
600
500
400
300
200
100
0
2000 2001 2002 2003 2004 2000 2001 2002 2003 2004
Male
Year of onset
Female
group the annual rate increase dropped from 27 per
cent to 14 per cent in males and from 26 per cent to
15 per cent in females.
In 2004, data on Indigenous status was complete
in 59 per cent of cases of chlamydial infection,
higher than the 43 per cent reported in 2003. The
combined chlamydial infection notifi cations in four
jurisdictions with greater than 50 per cent completeness
of Indigenous status (the Northern Territory,
South Australia, Western Australia, and Victoria)
show that in 2004, the age adjusted notifi cation rate
was 1,159 cases per 100,000 Indigenous population,
and 178 cases per 100,000 non-Indigenous
population (Table 12). The age adjusted rate ratio of
Indigenous to non-Indigenous was 7:1.
Although surveillance data continues to show substantial
increases in chlamydial infection notifications
nationally, 2004 data suggests that the rate of
increase has declined. As a large proportion of cases
with genital chlamydial infection are asymptomatic,
notification rates for this disease are particularly
Table 12. Trends in age adjusted notification rates of chlamydial infections, the Northern Territory, South Australia, Western Australia, and Victoria,
2000 to 2004, by Indigenous status*
Year NT SA Vic WA All
Non-
Indigenous Ratio †
Non-
Indigenous Ratio † Indigenous
Non-
Indigenous Ratio † Indigenous
Non-
Indigenous Ratio † Indigenous
Non-
Indigenous Ratio † Indigenous
Indigenous
Rate Rate Rate Rate
Rate Rate Rate Rate Rate Rate
2000 1,177.5 271.1 4.3 556.6 60.4 9.2 – – – 974.6 115.5 8.4 905.5 98.1 9.2
2001 1,412.2 348.9 4.0 452.3 95.6 4.7 – – – 1,028.8 119.1 8.6 994.9 118.3 8.4
2002 1,511.4 435.4 3.5 548.3 117.1 4.7 – – – 930.4 145.7 6.4 1,014.6 145.0 7.0
2003 1,796.1 449.8 4.0 568.3 130.6 4.4 135.1 145.3 0.9 1,211.7 171.6 7.1 1,102.1 153.4 7.2
2004 1,793.0 444.8 4.0 294.7 111.9 2.6 205.2 170.6 1.2 1,280.3 202.4 6.3 1,158.5 177.8 6.5
* The rates in non-Indigenous peoples include diagnoses in people whose Indigenous status was not reported.
† Ratio of Indigenous to non-Indigenous.
CDI Vol 30 No 1 2006 37