Jamestown Canyon Virus

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General Information

Jamestown Canyon Virus (JCV) is a viral disease spread by mosquitoes. It comes from the California serogroup, a class of diseases that can cause fevers and problems with the brain and spinal cord. JCV is generally reported in northern states, but can be found as far south as Georgia.  In the United States, human cases of JCV are rare. It is unknown how this disease affects animal populations.

In people who develop an illness, symptoms can range from mild to severe. Common symptoms include a fever and flu-like illness. In more serious cases, the disease may progress to swelling of the brain and surrounding areas, changes in mental status, seizures, and death. It is unknown how long it takes symptoms to develop after a mosquito bite. About 50% of cases are hospitalized and less than 50% develop serious brain or spinal cord issues. There is no specific treatment for JCV. The disease is best prevented by avoiding exposure to mosquitoes.

Resources for Maine Residents

Other Mosquito-borne Diseases in Maine

Additional Resources