Jamestown Canyon Virus Statistics

Cases of Jamestown Canyon virus occur throughout the United States but are only reported sporadically. The Centers for Disease Control and Prevention (CDC) began reporting for JCV in 2004 and has since received a few reports of JCV cases each year. Under-diagnosis and under-reporting of disease are likely as diagnostic testing for JCV is not widely available. Increasing numbers of cases in recent years may be due to increased awareness and testing.

Much remains unknown about the clinical spectrum of Jamestown Canyon virus disease, but the typical presentation includes fever, and in more severe cases, meningitis or encephalitis. Human disease cases occur during warmer months when mosquitoes are active, most commonly between May and September. The virus is likely widespread throughout Minnesota.

In 2022, one case of Jamestown Canyon virus disease was reported in Minnesota. The case was a 74-year-old male who presented with meningitis. He had illness onset in late June and exposure in north-central Minnesota. 

Charts and Graphs

• Reported Cases of Jamestown Canyon virus disease in Minnesota by Year, 2013-2022 (PDF)
  Graph showing the number of reported cases of Jamestown Canyon virus disease in Minnesota by year.
• Reported Cases of Jamestown Canyon Virus Disease by County of Residence, Minnesota, 2013-2022 (PDF) 
  Map of reported cases of Jamestown Canyon virus disease by county of residence.

Annual summaries

• Arboviral Disease, 2019
  Minnesota Department of Health Disease Control Newsletter Annual Summary of Communicable Diseases Reported to the Minnesota Department of Health, 2019
  • Arboviral Disease, 2018
  • Arboviral Disease, 2017
  • Arboviral Disease, 2016
  • Arboviral Disease, 2015
  • Arboviral Disease, 2014