NewsDesk @bactiman63

New Hampshire state health officials have reported the first human Jamestown Canyon Virus (JCV) case of the year in an adult from Hillsborough County.


JCV is transmitted by the bite of an infected mosquito and symptoms of infection may include flu-like illness, fever, muscle aches, headaches, and fatigue. Individuals with JCV can progress to more serious central nervous system diseases, including meningitis or encephalitis.

In addition, officials report two cases of Powassan Virus (POWV), one in an adult in Rockingham County and one in a child from Carroll County.

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POWV is transmitted through the bite of the blacklegged tick. An infected tick only needs to be attached to a person for 15 minutes to transmit POWV. This is the same tick that transmits Lyme Disease, Anaplasmosis, and Babesiosis. Early symptoms can include fever, muscle aches, headaches, and fatigue. More serious central nervous system disease, including meningitis or encephalitis can occur.

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“Mosquitoes will be with us until the first hard frost, and ticks remain active as long as there is no snow cover and temperatures remain above freezing,” said Ryan Tannian, Chief of the Division of Public Health Services (DPHS) Bureau of Infectious Disease Control. “Preventing the bites that cause illnesses transmitted by mosquitoes and ticks is a key factor in reducing the risk for illness.”

New Hampshire has reported a total of 13 human cases of JCV since 2018. New Hampshire has identified a total of 8 cases of POWV since 2013, when the disease was first detected in humans in New Hampshire.

New Hampshire

There are no vaccines or anti-virus medications to treat JCV or Powassan virus infections. The best way to stay healthy and prevent illness from these and other tick- and mosquito-transmitted infections is to prevent tick and mosquito bites.