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 May 11, 2012 - Mosquito Sample Collected in Dauphin County Tests Positive for West Nile Virus

​HARRISBURG, PA (May 11, 2012)–Dauphin County’s West Nile Virus Control Program has collected the county’s first mosquito sample infected with West Nile Virus (WNV) this year.

The infected sample was collected on May 9, 2012 in Middletown Borough. This sample was small and contained less than 100 mosquitoes.

“The county’s WNV Control Program is increasing surveillance and control measures to reduce the mosquito population,” Dauphin County Commissioners Jeff Haste, Mike Pries and George P. Hartwick, III said today.

Certain species of mosquitoes carry WNV, which, when transmitted to people, can cause West Nile encephalitis, an infection that can result in an inflammation of the brain. According to the Centers for Disease Control and Prevention (CDC), all residents of areas where virus activity has been identified are at risk of getting West Nile encephalitis.

The following precautions are also recommended, particularly for those individuals who are most at risk:

  • Buy products with Bti (Bacillus thuringiensis israelensis)—a naturally-occurring bacteria that kills mosquito larvae but is safe for people, pets and plants—for stagnant pools of water in the lawn and garden,
  • Remove any standing water in pots, containers, pool covers, tires, wheelbarrows, wading pools, roof gutters and other containers that hold water,
  • Make sure screens fit tightly over doors and windows to keep mosquitoes out of homes,
  • Consider wearing long-sleeved shirts, long pants and socks when outdoors, particularly when mosquitoes are most active at dawn and dusk, or in areas known for having large numbers of mosquitoes, 
  • Reduce outdoor exposure at dawn and dusk during peak mosquito periods, usually April through October, and
  • Use insect repellents according to the manufacturer’s instructions. An effective repellent will contain DEET, picaridin or oil of lemon eucalyptus. Consult with a pediatrician or family physician if you have questions about the use of repellent on children, as repellent is not recommended for children under the age of two months.

No human cases of WNV have been reported in Dauphin County.

To learn more about WNV and prevention, visit the CDC’s Web site at For more information about Dauphin County’s WNV Control Program, contact Eric Naguski, program coordinator, at 717-921-8100.

Category: Commissioners
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