Increased emergency department chief complaints of fever identified the influenza (H1N1) pandemic before outpatient symptom surveillance

Table 1 Onset of epidemic (week of year): influenza-like symptoms (ILS) activity in the community and chief complaints of fever in the emergency department (ED)

Year	Onset week		Maximum ED fever visits—1 week N
Year	ILS	ED	Maximum ED fever visits—1 week N
2005–2006	1	10	52
2006–2007	49	51	76
2007–2008	51	3	65
2008–2009	48	None	44
2009–2010	26	24	101

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