New Jersey Department of Health

PO Box 360
Trenton, NJ 08625-0360

For Release:
June 23, 2021

Judith M. Persichilli

For Further Information Contact:
Office of Communications
(609) 984-7160

Jamestown Canyon Virus Identified in Sussex County

A Sussex County resident in his 60s tested positive for Jamestown Canyon virus (JCV) after an onset of fever and neurological symptoms in May. This is the first detection of a mosquito-borne disease in the State this year and only the second human case of JCV reported in New Jersey (the first case was in 2015, also in Sussex County). JCV is transmitted by the bite of an infected mosquito. There are no vaccines to prevent JCV and treatment consists of supportive care. JCV has not been detected in mosquitoes yet this season but has been detected in previous years.

“Spending time outdoors, whether walking, gardening, or playing with our dogs, is a good way to maintain physical and mental health, but it is important to take steps to prevent mosquito and tick bites, which are responsible for several diseases in New Jersey” said Health Commissioner Judith Persichilli. “When enjoying the outdoors, remember to use an EPA-registered insect repellent, cover skin with clothing when you can, and check yourself and your pets for ticks and quickly remove them with tweezers.”

Jamestown Canyon virus circulates widely in North America primarily between deer and mosquitoes but can also infect humans. Reports in humans have been increasing over the last several years as recognition and testing for this virus has increased. Many illnesses caused by JCV are mild, but moderate-to-severe central nervous system involvement requiring hospitalization have been reported, including fatal infections. NJDOH can assist healthcare providers with testing for Jamestown Canyon virus.

Many people infected with mosquito and tickborne diseases may not develop any symptoms, or only develop very mild symptoms. Early symptoms can include flu-like illness including fever, muscle aches, headaches, and fatigue, which may be confused with other illnesses, including COVID-19. Some mosquito and tickborne infections can also cause more serious central nervous system disease, including meningitis or encephalitis (e.g., Eastern Equine encephalitis, Jamestown Canyon virus, Powassan, West Nile virus). “If you or someone you know is experiencing flu-like symptoms, including fever and headache, contact your healthcare provider and let them know if you suspect a mosquito or tickborne illness,” said Commissioner Persichilli.

In addition to JCV, New Jersey residents are also at risk for other mosquito-borne diseases, including West Nile virus (WNV) and Eastern Equine Encephalitis (EEE), which are generally seen in summer and early fall until mosquitoes are no longer biting.

“The New Jersey Department of Environmental Protection’s Office of Mosquito Control and Coordination works closely with the Department of Health and county mosquito control agencies to monitor and reduce mosquito populations and limit potential public health risks as much as possible,” said DEP Commissioner Shawn M. LaTourette. “New Jersey residents can help to reduce these risks by taking steps to eliminate standing water on the grounds of their homes and businesses. Checking flowerpots, pet food and water dishes, birdbaths, swimming pool covers and other places that hold water can significantly reduce the risk of mosquito bites and the illnesses they can carry.  Having taken these steps, if you still notice a mosquito problem around your home, reach out to your county mosquito control program for assistance.”

As people are susceptible to mosquito-borne disease, they can also cause severe illness and death in horses. “The Department of Agriculture encourages animal owners to be vigilant in vaccinating their animals against diseases spread by mosquitoes. Vaccinated animals are much less likely to contract deadly diseases such as Eastern Equine encephalitis and West Nile virus,” said Secretary of Agriculture Douglas Fisher.

Steps you can take to prevent mosquito and tickborne diseases:

Fight the Bite!

  • Wear EPA-registered insect repellant when outdoors and wear protective clothing (long sleeves and pants). Light-colored clothing helps you spot ticks! Cover crib, stroller and baby carriers with mosquito netting.
  • Avoid being outdoors during dawn and dusk when mosquitos are most active.
  • Shower as soon as possible after spending time outdoors and wash and dry your clothing. Tumbling clothes in a dryer on high heat for 10 minutes will kill ticks on dry clothing (damp clothes may need more time).
  • Check for ticks frequently and at least daily, on you and your pets. Ticks can hide under the armpits, behind the knees, in the hair, and in the groin. Early removal of ticks (with tweezers) can reduce the risk of infection.
  • When in tick-infested areas, walk in the center of trails to avoid contact with overgrown grass, brush, and leaf litter at trail edges.
  • Treat clothing with permethrin, ideal for persons who hike or spend a lot of time outdoors.
  • Monitor your health closely after a tick bite and during mosquito season and be alert for symptoms of illness. Contact your healthcare provider to discuss testing and treatment.

Proof your Home!

  • Repair holes in screens to keep mosquitoes outside and use air conditioning when possible.
  • Reduce areas where hosts for ticks, such as rodents and deer, can congregate to eat, sleep or feed.
  • Trim weeds and tall grasses that can provide an outdoor home for ticks.
  • Remove standing water around your home because that’s where mosquitoes lay eggs:
  • Empty standing water at least once or twice a week from flowerpots, pet dishes, birdbaths, swimming pool covers, buckets, barrels, cans, etc.
  • Drill holes in the bottom and elevate recycling and other containers if left outdoors. Turn over plastic wading pools and wheelbarrows when not in use.
  • Repair and clean storm-damaged roof gutters, particularly if leaves from surrounding trees tend to clog drains. Roof gutters can produce millions of mosquitoes each season!
  • Aerate ornamental pools or stock them with fish. Water gardens become major mosquito producers if they stagnate!
  • Clean and chlorinate swimming pools, including when not in use.
  • If you have a mosquito problem after taking the above steps, call your county mosquito control agency and ask for assistance. There are larval habitats that only your local mosquito control program can properly address.

Protect Pets and Horses!

  • Protect your pets by using tick prevention medications and/or vaccines as advised by a veterinarian. Remember – your pets can bring ticks indoors!
  • Vaccinate your horses against Eastern Equine encephalitis and West Nile virus.


For more information on diseases transmitted by mosquitoes and ticks and ways you can protect yourself, visit the Department of Health’s web page

For Weekly Updates on Mosquito and Tickborne Disease and Vector Surveillance in New Jersey, visit

To learn about the New Jersey State Mosquito Control Commission and for links to county mosquito control agencies, visit

To learn about disease control programs for protecting the health and well-being of livestock in New Jersey, visit

Follow the New Jersey Department of Health on Twitter @njdeptofhealth, Facebook /njdeptofhealth, Instagram @njdeptofhealth and LinkedIn /company/njdeptofhealth.