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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.

2021 Arboviral Test Results Bulletin Adobe Acrobat Reader Symbol
During the arboviral surveillance season (July 1st through October 15th), arboviral test results are updated and published every Thursday. The New Hampshire Arbovirus Surveillance Bulletin includes mosquito, animal and human test summaries for the current year and cumulative test summaries for prior years.

2021 Arboviral Risk Map Adobe Acrobat Reader Symbol
Throughout the arboviral season, the Bureau of Infectious Disease Control (BIDC) determines the 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 for focal areas are further defined and described in the Response Plan. A positive finding may or may not change the risk level of the focal area surrounding the finding. The risk map is updated when new positives are identified.

2021 Jamestown Canyon Virus Mosquito Testing
In collaboration with Cornell University, the Northeast Center of Excellence in Vectorborne Diseases, and the New Hampshire Division of Forest and Lands the NH Division of Public Health Services is conducting surveillance for Jamestown Canyon Virus (JCV) in mosquitoes throughout the 2021 summer season. JCV is a virus found in nature and transmitted through the bite of mosquitoes that bite mammals. JCV is present in the Eastern United States and was first identified in a NH resident in 2013. Since 2013 JCV has become the leading cause of arboviral related illness in NH.

This collaborative project aims to: determine which mosquito species play a role in the amplification or transmission of JCV in NH, estimate the distribution and prevalence of the virus in local mosquito-populations, and evaluate mosquito traps and lures for effectiveness.

In 2021, mosquito collections are in cities and towns that:

  1. Had at least one case of JCV in recent years (OR)
  2. Is adjacent to a city or town that had least one human case of JCV in recent years

All trapping locations are located near wetland areas since this is the habitat preferred by mosquitoes that are known to transmit JCV. As limited funding for testing is available, only mosquitoes collected at these locations will be tested for JCV at the NH Public Health Laboratories (NH PHL). Routine testing of JCV in mosquitoes submitted to the NH PHL in future years is dependent on the availability of funds.

Social Media
Any new positives identified will be posted on the Bureau of Infectious Disease Control's social media accounts:

Historical Data

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

Summary Report
Arboviral Risk Map
Arboviral Test Results Bulletin
Public Health Threats
2020 2020 2020  
2019 2019 2019  
2018 2018    
2016 2016 2016  
2015 2015 2015  
2014 2014 2014  
2013 2013 2013  
2012 2012 2012 08/04/2012
2011 2011 2011  
2010 2010 2010  

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
129 Pleasant Street | Concord, NH | 03301-3852

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