New Hampshire health officials have recorded the second human Jamestown Canyon virus (JCV) case of the year in an adult from Goffstown. This follows a case confirmed in mid-August in Hanover.


It is likely that this case was acquired in New Hampshire, but due to recent travel, location of exposure is not certain.

“As we head into the fall, it’s important for people to remember that mosquito-borne diseases like Jamestown Canyon Virus are still a risk in New Hampshire,” said State Epidemiologist Dr. Benjamin Chan. “We want residents and visitors to continue to enjoy the outdoors, but they should take steps to protect themselves from mosquito bites as long as mosquitoes are still around.”

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Until the second hard frost of the season, residents and visitors to New Hampshire should continue to protect themselves and their family members from mosquito-borne diseases by using an effective mosquito repellant that contains 30% DEET, wearing long sleeves and pants at dawn and dusk when mosquitoes are most active, and removing standing water from around your home so mosquitoes do not have a place to breed. Repellents with picaridin, IR3535 and some oil of lemon eucalyptus and para-menthane-diol products also provide protection against mosquito bites. A hard frost is defined as two consecutive hours of temperatures below 28 degrees Fahrenheit.

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Initially described in the early 1970s, JCV is a mosquito-borne pathogen that circulates widely in North America primarily between deer and a variety of mosquito species, but it can also infect humans. Reports of JCV in humans are rare (Since 2000, more than 50 cases of JCV have been identified nationally. The cases have primarily been in the Midwest and Northeast) and most reported illnesses caused by Jamestown Canyon virus have been mild, but moderate-to-severe central nervous system involvement has been reported.

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