NSW as at 10th January 2008

Recent vs older cases

The graph below shows the changing numbers of recent and older cases over time, as well as the number of infected premises that have been resolved.

• Recent cases (red bars) are ones which have been reported as infected within the last 21 days and are likely to still be actively infected.
• Older cases (blue bars) are ones that have been infected for more than 21 days.
• Resolved cases (green bars) are ones that have been assessed and are no longer considered to be infected.

As can be seen, the number of recent cases reached a peak in late September, started to decline from about the second week of October and is now down to 3. Numbers of older cases has also decreased rapidly since late November, as increasing numbers of IPs are resolved. There are now 264 old cases remaining to be resolved, out of a total of about 5,800 cases for the entire outbreak.

Weekly epidemic curve

The graph below shows the number of new infected premises recorded each week of the outbreak since 25 August, as well as the 3-week rolling average number of new cases (red line). Numbers of new cases increased rapidly in the first few weeks, reaching a peak of about 1,000 cases in the 4th week (late September). Numbers of new cases have declined substantially since about week 7. During weeks 11-14 (early November to early December) the number of new cases averaged about 50 per week and has declined further during December to less than 5 per week.

There have been no new cases since the 24th December 2007.

New infected premises

There have been no new infections confirmed by laboratory tests since 24th December 2007.