The Mississippi State Department of Health reported a case of Jamestown Canyon virus (JCV) in Lamar County today. The clinical details of the case were not made available; however, symptoms of infection can vary from none to encephalitis.
JCV is endemic and widely distributed in the USA from the Rocky Mountains eastward, causing sporadic cases of febrile disease and encephalitis in humans. Cases of JCV infection occur occasionally in Mississippi; most recently in 2006.
JCV circulates among deer, horses, and other large wild and domestic mammals by way of mosquito bites. It can also be transmitted to humans by the same mechanism. The virus is relatively rare, but may be carried by several types of mosquito, including the tree hole mosquito, Ochlerotatus (Aedes) triseriatus.
JCV is one of 14 related viruses belonging to the California encephalitis virus species. This is one of a large number of species comprising the genus Bunyavirus of the family Bunyaviridae.
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