2003-2004 season summary of flu activity
 
Influenza activity during the 2003-2004 season first became widespread in Arizona in the week ending 12/6/2003 (week 49) and dropped back to regional after 1/3/2004 (week 53).  (Click to see definitions of reporting categories.)  The peak of activity in Arizona and in many states was much earlier this year than usual.  The predominant strain identified nationally was influenza A/Fujian(H3N2).  Five influenza-associated deaths among Arizona children were confirmed in the 2003-2004 season.  

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 Lab surveillance
 
The Arizona State Laboratory confirmed and subtyped 107 cases of influenza A during the 2003-2004 influenza season.  These isolates were all influenza A(H3N2).  Arizona's first laboratory-confirmed case was identified in mid-October. An additional 11 isolates were identified as influenza A but could not be subtyped, and one isolate was identified as influenza B.

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Influenza-like illness (ILI) surveillance from sentinel providers 

Influenza-like illness (ILI) surveillance measures the proportion of patient visits to sentinel providers for ILI out of the total visits each week.  The peak of ILI during the 2003-2004 season occurred in the week ending 12/13/2003. 

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