During the second wave of the 2009 H1N1 epidemic in Wisconsin (August 30, 2009 –January 2, 2010), H1N1 cases and hospitalizations were widespread throughout the state. Cases and hospitalizations peaked in late October and early November. Since late November, influenza activity in Wisconsin has remained low compared to what is normally seen at this time of year. DHS and partners continue to conduct surveillance for a possible third wave of H1N1 influenza or an increase in seasonal influenza activity.

Influenza Surveillance Data

• Graph - Weekly WHIE Emergency Department Fever Visits
• Table - 2009 H1N1 Influenza Cases, Hospitalizations, and Deaths in Wisconsin [PDF] [March 29, 2010]
• Graph - Weekly 2009 H1N1 Influenza Cases in Wisconsin [PDF] [March 29, 2010]

Archived Second Wave 2009 H1N1 Influenza Surveillance Data (August 30, 2009 - January 2, 2010)

• 2009 H1N1 Fall Surveillance Summary [PDF] [January 12, 2010]
• Historical Table - 2009 H1N1 Influenza Cases, Hospitalizations, and Deaths in Wisconsin Second Wave [PDF] [March 29, 2010]
• Historical Map - 2009 H1N1 Influenza Case Rates Second Wave [PDF] [January 22, 2010]
• Historical Map - 2009 H1N1 Influenza Hospitalization Rates Second Wave [PDF] [January 22, 2010]

Archived First Wave 2009 H1N1 Influenza Surveillance Data (April 15, 2009 - August 29, 2009)

• Historical Table - 2009 H1N1 Influenza Cases, Hospitalizations, and Deaths in Wisconsin First Wave [PDF] [October 9, 2009]
• Historical Map - 2009 H1N1 Influenza Cases First Wave [PDF] [September 18, 2009]
• Historical Map - 2009 H1N1 Influenza Case Rates First Wave [PDF] [September 18, 2009]