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For the third time this year, New Hampshire state health officials have reported a case of Jamestown Canyon Virus (JCV), a mosquitoborne viral infection.

National Atlas of the United States

The patient is an adult from Dunbarton and was hospitalized with a fever and headache. The patient is currently recovering at home.

“This is the third detection of Jamestown Canyon Virus infection in our State this year, and the risk for Jamestown Canyon Virus and other mosquito-transmitted viral infections will only increase until there is a mosquito-killing hard frost in the fall,” said Dr. Benjamin Chan, NH State Epidemiologist. “All three of the mosquito-transmitted infections able to be acquired in NH can cause severe neurologic illness, and it remains important for residents and visitors to protect themselves and their families by preventing mosquito bites.”

Aedes aegypti mosquito

Jamestown Canyon Virus is a mosquito-borne pathogen that circulates widely in North America primarily between deer and mosquitoes but can also infect humans. Reports in humans have been increasing over the last several years as recognition and testing for this virus has increased. This is New Hampshire’s twelfth case of JCV since the first report of the disease in the State in 2013. Many illnesses caused by JCV are mild, but moderate-to-severe central nervous system involvement requiring hospitalization have been reported, including fatal infections.

Second Jamestown Canyon Virus case reported in New Hampshire

Michigan: Jamestown Canyon virus case confirmed in Ottawa County

Jamestown Canyon Virus: 1st case reported in New Hampshire this year