Table 1. Influenza-like illness cases, by time period, New South Wales, Australia, July–September 2009*.

Period	Estimated no., millions	Estimated incidence, % (95% CI)
July	0.85 (0.64–1.06)	12.1 (9.1–15.0)
August	0.52 (0.38–0.67)	7.4 (5.3–9.5)
September	0.25 (0.09–0.42)	3.6 (1.2–5.9)
July–September	1.63 (1.33–1.94)	23.1 (18.8–27.4)

*Data from 2,909 New South Wales Population Health Survey respondents. Influenza-like illness defined as fever with cough and fatigue. CI, confidence interval.