Surveillance Lessons from First-wave Pandemic (H1N1) 2009, Northern California, USA

Abstract

After the appearance of pandemic (H1N1) 2009 in April 2009, influenza activity was monitored within the Kaiser Permanente Northern California division by using laboratory, pharmacy, telephone calls, and utilization (services patients received) data. A combination of testing and utilization data showed a pattern of disease activity, but this pattern may have been affected by public perception of the epidemic.

Keywords

• Influenza
• H1N1
• surveillance
• California
• pandemic
• pandemic (H1N1) 2009