Town of Bow has state’s second case this year of Jamestown Canyon virus, a mosquito-borne disease

Monitor staff
Published: 8/7/2020 10:10:01 AM

The state has identified a second case of Jamestown Canyon virus, an infection transmitted by mosquitoes, in Bow.

The person, identified only as an adult, “was not hospitalized and is doing well, but experienced fever and mild neurological symptoms,” the Department of Health and Human Services said in a press release.

This is the second detection of JCV in the state this year. JCV is transmitted by the bite of an infected mosquito. There are no vaccines to prevent JCV and no good treatment.

The arboviral risk level, which indicates the likelihood that a mosquito bite will transmit a disease,  will be increased to high for Bow. The risk level in surrounding towns of Goffstown, Dunbarton, Hopkinton, and Allenstown will increase to moderate. The risk level for the surrounding towns of Hooksett, Pembroke and Concord will remain moderate.

“Jamestown Canyon Virus is one of three different infections that can be transmitted through the bite of a mosquito in New Hampshire,” said Dr. Benjamin Chan, N.H. state epidemiologist. “The risk for mosquito-transmitted infections will only increase through the summer and fall until there is a mosquito-killing hard frost. New Hampshire residents and visitors need to continue to take steps to protect themselves from mosquito bites.”

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 eleventh 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.

 In addition to JCV, risk for infection in NH by Eastern Equine Encephalitis virus (EEEV) and West Nile Virus (WNV) will continue to increase through the summer and fall until mosquitoes are no longer biting.

Early symptoms for all of these can include fever, muscle aches, headaches, and fatigue. More serious central nervous system disease, including meningitis or encephalitis can occur with these diseases.


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