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Health Department

(973) 593-3079
(973) 593-3072
Madison Civic Center
28 Walnut Street
Madison, NJ 07940 (map)

West Nile Virus Morris

mosquitoWest Nile Virus

West Nile Virus activity continues to be a concern (in mosquitoes, birds and humans) in New Jersey. 

How Prevalent was WNV in 2013 in Morris County?

  • Five human cases of WNV have been identified in the following four counties: Bergen (1), Burlington (1), Camden (2), Gloucester (1) and Morris (1)
  • 19 birds tested positive for WNV from 8 counties, none from Morris to date
  • 390 mosquito pools tested positive for WNV from 19 counties, including: Morris with 22
  • Local mosquito commissions are working hard with local health departments to monitor and control the spread of West Nile Virus in the mosquito population

When is the Peak Season for WNV?

         In the past, peak West Nile Virus activity in New Jersey usually occurred in 

How is WNV transmitted to people?

         West Nile Virus is transmitted primarily by the bite of an infective mosquito. Residents
         are advised to take precautions to reduce the risk of mosquito bites.

What Can Be Done to Prevent WNV?

  • When outdoors, use insect repellent containing an EPA-registered active ingredient: The gold standard for mosquito repellent is DEET, which may be used on adults and children greater than two months of age
  • Limit time outdoors at dawn and dusk, when mosquitoes are most active, or wear long-sleeved shirts and long pants during those times
  • Keep mosquito netting over infant seats and strollers
  • Eliminate any standing water where mosquitoes can lay eggs. Mosquitoes that breed around the home are primarily responsible for transmitting West Nile Virus to humans!
    Morris County residents may report mosquito problems and standing water to the Morris County Mosquito Commission at (973) 285-6450
  • Install or repair window and door screens
  • Support community-based mosquito control programs

What are the Symptoms of WNV?

          West Nile virus infection generally causes no symptoms or mild flu-like symptoms.
         About one in 150 people infected with WNV, or less than one percent, will develop a more
         severe form of the disease. Symptoms of the more severe disease can include severe
         headache, high fever, neck stiffness, stupor, disorientation, coma, tremors, convulsions,
         muscle weakness, paralysis and death. The elderly are at higher risk of more severe

What are other sources of information on WNV?