Influenza activity has increased in Wisconsin in early September and has remained elevated in most areas of the state compared to what is normally seen at this time of year. DHS has not yet observed the type of week-to-week community escalation that occurred in the spring, however schools in some communities have reported high numbers of student absences due to influenza-like illness and this could be an early indication that community-wide activity will intensify in the coming weeks.  Laboratory confirmed cases, which represent a small fraction of the total number of infected persons, have been reported from over two thirds of Wisconsin’s 72 counties.  99% of all the circulating influenza viruses have been confirmed as H1N1. No H1N1 viruses in the state have been found to be resistant to antiviral medications.

Influenza Surveillance Data

• Weekly Influenza Surveillance Report [PDF] [November 16, 2009]
• Graph - Weekly WHIE Emergency Department Fever Visits
• Table - 2009 H1N1 Influenza Cases, Hospitalizations, and Deaths in Wisconsin [PDF] [November 20, 2009]
• Graph - Weekly 2009 H1N1 Influenza Cases in Wisconsin [PDF] [November 20, 2009]
• Map - 2009 H1N1 Influenza Cases in Wisconsin [PDF] [November 18, 2009]
• Map - 2009 H1N1 Influenza Rates in Wisconsin [PDF] [November 18, 2009]

Archived 2009 H1N1 Influenza Surveillance Data - Covers April 15 to August 29, 2009

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