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PDF file - Department of Health and Ageing

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National Notifiable Diseases Surveillance System, 2004<br />

Annual report<br />

Map 6. Notification rates <strong>of</strong> pertussis, Australia, 2004, by Statistical Division <strong>of</strong> residence<br />

Figure 46. Notification rates <strong>of</strong> pertussis, New<br />

South Wales, South Australia, Western Australia<br />

<strong>and</strong> Australia, 1999 to 2004, by month <strong>of</strong><br />

notification<br />

A review <strong>of</strong> cough symptoms in children in Sydney<br />

has provided evidence <strong>of</strong> cases <strong>of</strong> pertussis which<br />

are not notifi ed. Clinically diagnosed pertussis was<br />

estimated to be between 5 <strong>and</strong> 20 times the notifi cation<br />

rates. 17<br />

Rate per 100,000 population<br />

350<br />

300<br />

250<br />

200<br />

150<br />

100<br />

50<br />

0<br />

Jan Jul<br />

1999<br />

New South Wales<br />

South Australia<br />

Western Australia<br />

Australia<br />

Jan<br />

2000<br />

Jul<br />

Jan<br />

2001<br />

Jul<br />

Jan<br />

2002<br />

Jul<br />

Month <strong>and</strong> year<br />

Jan<br />

2003<br />

Jul<br />

Jan<br />

2004<br />

Jul<br />

Invasive pneumococcal disease<br />

Case defi nition – Invasive pneumococcal<br />

disease<br />

Only confirmed cases are notifi ed.<br />

Confirmed case: Requires isolation <strong>of</strong><br />

Streptococcus pneumoniae from a normally<br />

sterile site by culture or detection by nucleic<br />

acid testing.<br />

There were 153 cases who were identified as Indigenous<br />

(31.6 cases per 100,000 population) <strong>and</strong> 8,227<br />

who were identified as non-Indigenous (41.9 cases<br />

per 100,000 population). The Indigenous pertussis<br />

notification rate ratio for all ages was therefore 0.75,<br />

but it is important to note that previous analyses have<br />

shown that, in the age groups where the disease is<br />

most severe, there were higher rates in Indigenous<br />

compared to non-Indigenous populations. For example,<br />

in 2000–2002 the notification rate ratio for children<br />

aged 0–4 years was 1.7, <strong>and</strong> 2.6 for those aged<br />

less than one year. 12<br />

There were 2,375 notifi cations <strong>of</strong> invasive pneumococcal<br />

disease (IPD) in Australia in 2004 giving a<br />

rate <strong>of</strong> 11.8 cases per 100,000 population. While the<br />

largest number <strong>of</strong> cases were reported from New<br />

South Wales, Queensl<strong>and</strong> <strong>and</strong> Victoria (Table 1), the<br />

highest rate was in the Northern Territory (47 cases<br />

per 100,000 population). The geographical distribution<br />

<strong>of</strong> IPD varied within states <strong>and</strong> territories, with<br />

the highest rates in Central <strong>and</strong> northern Australia.<br />

CDI Vol 30 No 1 2006 51

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