A mosquito trap in Drumbo tested positive for the virus during routine surveillance.
The product used will be a mosquito pesticide called Zenivex E20, which kills adult mosquitoes, but is not harmful to people and pets.
The health district said mosquito testing, which began in June is expected to continue through the late fall.More news: Trump going ahead with taxes on $16B in Chinese imports
The chances of getting West Nile Virus from an infected mosquito are low.
Health officials say the patient was infected with the more serious neuroinvasive form of the disease.
Cover children's playpens or baby carriages with netting when outdoors.More news: Crude Oil Settles Higher On Supply Worries
Clean your gutters and flush birdbaths or fountains once a week.
"Over the past few weeks, West Nile virus activity has been on the rise across Ontario, so it's not surprising to see positive mosquito pools in Perth County", says Dale Lyttle, Senior Public Health Inspector.
Use effective insect repellent such as DEET or Picaridin. In an outbreak in 2012, more than 1,000 people were infected and 36 people died across four North Texas counties.More news: Boris Johnson told to apologise over 'totally out of order' burka comments
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