Receding floodwaters and heavy rains across Pennsylvania are creating a perfect storm of conditions, that have contributed to the highest level of West Nile Virus activity in the mosquito population since the disease was first introduced in 2000.
The disease, which has infected more than 150 people in the past six years, is on track to pose an unusually higher than normal risk this year and is widespread throughout the Commonwealth, having already been found in 52 Pennsylvania Counties as of Friday.
New counties this week include-- McKean, Mifflin, Monroe, and Perry.
DEP previously reported West Nile Virus was found in these counties-- Adams, Allegheny, Beaver, Bedford, Berks, Blair, Bucks, Cambria, Carbon, Centre, Chester, Clearfield, Clinton, Columbia, Cumberland, Dauphin, Delaware, Elk, Erie, Fayette, Forest, Franklin, Fulton, Greene, Huntingdon, Indiana, Juniata, Lackawanna, Lancaster, Lawrence, Lebanon, Lehigh, Luzerne, Lycoming, Mercer, Montgomery, Montour, Northampton, Northumberland, Philadelphia, Schuylkill, Snyder, Somerset, Union, Washington, Westmoreland, Wyoming and York.
“With record levels of West Nile virus activity in mosquitoes already found, we are at increased risk of disease from a bite of a mosquito. It is imperative that Pennsylvania residents take common-sense precautions to protect themselves from mosquitoes,” said DEP Secretary Patrick McDonnell. “There has been one human case already this year. Our goal is for that to be the only one. By eliminating places for mosquitoes to lay eggs, using insect repellent and other protective measures, and targeted use of pesticides, we can all make sure Pennsylvanians are protected.”
Health Advisory
The Department of Health has issued an advisory through the Health Advisory Network to alert medical professionals about the risk of West Nile virus this year. Gov. Wolf and the legislature also recently approved a $140,000 increase to the program’s budget.
Last week the Department of Health reported the first human case of West Nile Virus this season in an Allegheny County resident.
Symptoms of West Nile virus in humans are typically like those of a mild flu, but the virus can lead to a more serious condition that includes swelling of the brain, muscle convulsions, coma, paralysis, and death.
Since DEP first began monitoring for the virus in 2000 there have been 33 fatal cases of West Nile virus in Pennsylvania.
“While the symptoms may not seem threatening in the vast majority of cases, serious impacts to health can occur from being bitten by mosquitoes that carry this virus,” said McDonnell.
“While the symptoms may not seem threatening in the vast majority of cases, serious impacts to health can occur from being bitten by mosquitoes that carry this virus,” said McDonnell.
Impacts On Birds
The virus can have devastating effects on bird populations as well. Pennsylvania’s state bird, the ruffed grouse, has been hit especially hard by the virus, and the winter hunting season for the bird has been curtailed as a result of the virus and habitat loss.
“The disease is especially deadly to birds, including grouse,” said Matt Helwig, a biologist with the DEP mosquito program. “Residents can also eliminate habitat by getting rid of standing and stagnant water where mosquitoes lay eggs.
Prevention
DEP West Nile virus program staff have conducted multiple operations to reduce mosquito habitats from tire piles and other areas. These efforts will be ongoing until the first hard frost of the year.
“Mosquitoes are weak flyers and won’t travel far from where they are born – if there are mosquitoes in your backyard or neighborhood, they are likely laying eggs there as well,” said Helwig, “If you’re being bitten by mosquitoes, they are 9 times out of 10 coming from your property. Get rid of even small amounts of standing water around your home.”
Common places water can accumulate are outdoor features like potted plants and birdbaths, yard debris like, storage bins, kids’ toys (including kiddie pools), rain gutters, and even corrugated downspouts.
“It doesn’t take much for several hundred mosquitoes to be born. The small pool of water that collects in a single upturned bottle cap is an incubator for as many as 300 mosquito eggs,” said Helwig. Mosquitoes acquire the virus by biting infected birds and transmit the virus to people through a subsequent bite.
Use of commonly sold insect repellants, like those using DEET, Picaridin, or other EPA-registered repellents, can also cut down on mosquito bites, and possible exposure to the virus. Long pants and sleeves are also an important way to cut down on possible exposure to mosquitoes.
Control Operations
Control Operations
DEP and county partners throughout the state will also conduct routine, localized spraying events to control infected adult populations of mosquitoes. These operations are conducted when and where deemed necessary based on recent population survey results.
“Control operations are a strong tool, but they are not a substitute for preventive measures like eliminating standing, stagnant water,” said Helwig.
Westmoreland Spraying
The Department of Environmental Protection Friday announced it’s West Nile Virus Program will conduct a mosquito control operation to reduce high populations of mosquitoes on Monday, August 6 in Ligonier Borough and portions of Ligonier Township, Westmoreland County. (Click Here for more.)
Click Here for a schedule of mosquito adulticiding events.
For more information about West Nile Virus and the state's surveillance and control program, visit the West Nile Virus website.
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