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EEE and WNV are arboviral illnesses spread by the bite of an infected mosquito. Mosquito, animal, and human specimens are tested for the presence of EEE and WNV infection at the New Hampshire Public Health Laboratories. Wild bird testing no longer provides useful data for NH's disease surveillance and will not occur on a regular basis.

Arboviral Test Results Bulletin

During the arboviral surveillance season (July 1st through September 30th), arboviral test results are updated and published every Tuesday. The New Hampshire Arbovirus Surveillance Bulletin includes mosquito, animal and human test summaries for the current year and cumulative test summaries for prior years.

Arboviral Risk Map

Throughout the arboviral season, the Bureau of Infectious Disease Control determines human risk levels as outlined in Section V: Recommendations for a Phased Response to EEE Virus and WNV Surveillance Data of the Arboviral Illness Surveillance, Prevention and Response Plan Adobe Acrobat Reader Symbol. Risk levels are defined for focal areas. "Focal Areas" may incorporate multiple communities, towns, or cities. Currently, only positive EEE and WNV test result data are analyzed to determine human risk levels; however, there are additional factors pertaining to overall human risk that are taken into consideration, which are elaborated on in the Arboviral Illness Surveillance, Prevention and Response Plan. A positive finding may or may not change the risk level of the focal area surrounding the finding.

The risk map will be updated as new positives are identified and posted on Tuesdays.


As new positives are identified, they will be Tweeted on the Bureau of Infectious Disease Control's Twitter page.

Historical Data

All data is in Adobe PDF Adobe Acrobat Reader Symbol format.

Risk Map
Eastern Equine
Encephalitis (EEE)
Risk Map
West Nile
Virus (WNV)
Risk Map
Public Health Threats
2016 2016 2016      
2015 2015 2015      
2014 2014 2014      
2013 2013 2013      
2012 2012 2012     08/04/2012
2011 2011 2011      
2010 2010 2010      
    2009 2009    
2008   2008 2008 2008  
      2007 2007  
      2006 2006  
      2003-2005 EEE and WNV Results Maps

Adobe Acrobat Reader Symbol Adobe Acrobat Reader format. You can download a free reader from Adobe.

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New Hampshire Department of Health and Human Services
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