The most up-to-date information from Public Health Ontario shows there have been three reported human cases of West Nile virus, two in Toronto and one that is travel-related.
There is new evidence of West Nile virus in Perth County.
The Health Unit is urging the public to take steps to prevent mosquito bites.
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West Nile virus activity is moving east.
Symptoms of West Nile virus include fever, confusion, muscles weakness and severe headache. In 2012, the last time Dallas County saw a major outbreak of West Nile virus, 398 residents contracted the virus and 21 died.
So far this mosquito season, about four dozen mosquito traps - in Addison, Balch Springs, Coppell, Dallas, DeSoto, Garland, Highland Park, Irving, Mesquite, Richardson, Rowlett and University Park - have captured mosquitoes with the virus, according to DCHHS.
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Use effective insect repellent such as DEET or Picaridin.
They are most active at dawn and dusk and will bite humans as well as other mammals and birds.
Wear long, loose and light-colored clothing. Health officials note that even a container as small as a bottle cap can become a mosquito breeding ground, so residents should take to eliminate standing water.
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