Jamestown Canyon virus – USA

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New Hampshire has reported the 1st case of the seasonal Jamestown Canyon virus in 2020. The rare viral infection is the 10th case in the state since 2013, amounting to about 50 cases in the Midwest and Northeast in the past 10 years.

The patient was an adult individual from Loudon, who is currently recovering at home after hospitalization for neurological symptoms. Local health authorities have declared the arboviral risk level to be high during this season.

Fever, headache, and fatigue are common symptoms with Jamestown Canyon virus disease. The virus rarely causes severe disease, but can cause infection of the brain (encephalitis) or the lining around the brain (meningitis).

There are no vaccines to prevent or medicines to treat Jamestown Canyon virus infection. Reduce your risk of infection by avoiding mosquito bites.

Female anopheles albimanus mosquito

Photo: Many types of mosquitoes are vectors for Jamestown Canyon virus. 

The mosquito virus was first identified from mosquitoes in Jamestown Canyon, Colorado, in 1961.

Mosquitoes become infected when they feed on deer and other animals that have the virus in their blood. Infected mosquitoes can then spread the virus to people and other animals by biting them.

he virus is found throughout much of the United States, but most cases are reported from the upper Midwest. Most cases occur from late spring through mid-fall.

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