Figure. A) Influenza A testing in Kaiser Permanente Northern California division (KPNC), 2009. Shown are total numbers of specimens sent, number of specimens positive for influenza A, and percentage of specimens positive for influenza A. B) Outpatient visits for influenza-like illness (fever, influenza, or upper respiratory infection) per 1,000 members, percentage of all hospitalizations with a diagnosis of pneumonia or influenza (P&I), and percentage of specimens positive for influenza A, KPNC, 2009. C) Influenza-related telephone calls to KPNC, 2009, and percentage of specimens positive for influenza A.
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