The Maine Center for Disease Control and Prevention (Maine CDC) announced that mosquitoes in Orono, Penobscot County, have tested positive for Jamestown Canyon virus (JCV). This is the first detection of any mosquito-borne virus in Maine this year.

Surveillance Testing and History

A mosquito pool, which is a collection of up to 50 mosquitoes, tested positive for JCV during routine surveillance conducted across Maine from June through fall.

Mosquito-Borne Viruses in Maine

Infected mosquitoes in Maine can transmit three viruses: Jamestown Canyon virus (JCV), Eastern Equine Encephalitis virus (EEE), and West Nile virus (WNV). While infections are rare, these diseases can have severe, sometimes fatal, consequences. The best protection is to take precautions against mosquito bites.

Symptoms and Prevention

Many people infected with these viruses show no symptoms, while others may experience mild flu-like symptoms such as fever, headache, and weakness. Severe symptoms can include:

  • Vomiting
  • Neck stiffness
  • Loss of coordination
  • Speech difficulties
  • Confusion
  • Seizures
  • Encephalitis (brain swelling)
  • Meningitis (inflammation of tissues around the brain and spinal cord)

If you experience any severe symptoms, contact a healthcare provider immediately.

Protective Measures

The Maine CDC urges everyone to take the following precautions to protect against mosquito bites:

  • Wear long sleeves and long pants.
  • Use an EPA-approved repellent on skin and clothing.
  • Take extra precautions at dusk and dawn when mosquitoes are most active.
  • Use screens on windows and doors.
  • Regularly drain artificial sources of standing water, such as bird baths, dog bowls, buckets, and children’s toys.
  • Take steps to prevent mosquito bites when traveling.

For more information: