The first cases of West Nile virus have been found in three municipalities – in Windsor-Essex, Perth County and Grey-Bruce.
In Windsor-Essex it is an adult male.
In Grey-Bruce it is a crow.
In Perth County it is mosquitoes trapped in Stratford.
"Most people with West Nile Virus never develop symptoms and will not know they have an infection with the virus," read a release from the Gre3y-Bruce health unit.
"Symptoms usually start to show between two to 14 days after a person is bitten by an infected mosquito. They can include fever, headache, nausea, vomiting, body aches, skin rash, and swollen lymph glands."
People 50 and over and those with compromised immune systems are the most at risk for severe disease.
Medical Officer of Health Dr Mehdi Aloosh said it's important for people to stay on guard while they are outdoors.
"Even though the temperatures are getting cooler, it is still important for everyone to eliminate any standing water around their property and take personal protective measures to avoid mosquito bites during the fall months," said Aloosh.
